{"id":41571,"date":"2023-09-14T09:30:37","date_gmt":"2023-09-14T07:30:37","guid":{"rendered":"https:\/\/www.nordtec.se\/sectors-and-areas\/ventilation-and-indoor-climate\/"},"modified":"2026-04-15T16:25:55","modified_gmt":"2026-04-15T14:25:55","slug":"ventilation-and-indoor-climate","status":"publish","type":"page","link":"https:\/\/www.nordtec.se\/en\/sectors-and-areas\/ventilation-and-indoor-climate\/","title":{"rendered":"Ventilation and indoor climate"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column alignfull is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full toppbild\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"2000\" height=\"350\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/toppbild_ventilation-inneklimat_2000x350.jpg\" alt=\"Top view of ventilation and indoor climate\" class=\"wp-image-35167\"\/><\/figure>\n<\/div>\n<\/div>\n\n<h1 class=\"wp-block-heading liten-sidrubrik has-small-font-size\" style=\"letter-spacing:1px\" data-block-type=\"core\">VENTILATION AND INDOOR CLIMATE<\/h1>\n\n<h2 class=\"wp-block-heading fet-stor-rubrik\" id=\"h-vagen-till-bra-klimat-laga-energiforluster-och-god-driftsekonomi\" data-block-type=\"core\"><span style=\"color: #ff9900;\" class=\"stk-highlight\">The road to a good climate, <\/span><span style=\"color: #000000;\" class=\"stk-highlight\">low energy losses and good operating economy<\/span><\/h2>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column nollmarginal-bottom is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<p>Service technicians and facility managers face a number of challenges on a daily basis. It is about ensuring good ventilation and comfortable temperatures &#8211; while minimizing the risks of costly leaks and unhealthy indoor environments.<\/p>\n\n\n\n<p>We have a wide range of flexible and accurate handheld instruments for measuring various quantities and conditions that affect the indoor climate.  <\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<p>Products that help you take a holistic approach to all environments to create the best possible climate for people and products.<\/p>\n\n\n\n<p>Also explore our offer for <a href=\"https:\/\/www.nordtec.se\/en\/calibration\/accredited-calibration\/\" target=\"_blank\" rel=\"noreferrer noopener\">accredited calibration<\/a> and <a href=\"https:\/\/www.nordtec.se\/en\/calibration\/service\/\" target=\"_blank\" rel=\"noreferrer noopener\">service<\/a>.<\/p>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-fef19ef\" data-block-id=\"fef19ef\"><style>.stk-fef19ef {height:20px !important;}<\/style><\/div>\n\n<div class=\"wp-block-columns testo565i-column is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2025\/09\/NZ5A9123_1000px.jpg\" alt=\"Tor VXPro with Celsicom V600 Reference Dose Meter\" class=\"wp-image-54749\"\/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h2 class=\"wp-block-heading\" id=\"h-en-drom-for-injusterare\" data-block-type=\"core\">A dream for air balancing technicians.<\/h2>\n\n\n\n<p>Adjusting ventilation doesn&#8217;t get any easier than this. All you need is our Celsicom V600 adjustment tool, an optional air flow meter and a mobile or tablet device. With this at hand, you can perform super-efficient adjustments.  <\/p>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Easy setting of K-factor and projected flows<\/li>\n\n\n\n<li data-block-type=\"core\">Shows the reference device flow (l\/s), pressure (Pa) and flow as a percentage of the design flow<\/li>\n\n\n\n<li data-block-type=\"core\">Calculates the flow rates to which all valves in the ventilation system should be adjusted<\/li>\n\n\n\n<li data-block-type=\"core\">If a pressure change occurs, all values are recalculated in seconds<\/li>\n\n\n\n<li data-block-type=\"core\">Saves a lot of time as the reference device does not need to be checked several times<\/li>\n\n\n\n<li data-block-type=\"core\">Enables a ventilation technician to perform large and small adjustments all by himself<\/li>\n<\/ul>\n\n\n\n<p><strong><a href=\"https:\/\/www.nordtec.se\/en\/campaign\/celsicom-v600\/\">Read more here<\/a><\/strong><\/p>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\" id=\"h-ventilations-och-luftkonditioneringssystem\" data-block-type=\"core\">Ventilation and air conditioning systems<\/h2>\n\n<p>A good indoor climate is a matter of course in today&#8217;s companies. Advanced ventilation and air conditioning systems ensure the best possible conditions in workplaces. Making these systems work optimally requires careful settings and continuous maintenance.<\/p>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"499\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-400-Vane-anemometer-16mm-bluetooth-800x500_im4c.jpg\" alt=\"Air flow measurement in ducts\" class=\"wp-image-35166\"\/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h3 class=\"wp-block-heading\" id=\"h-ventilationskanaler\" data-block-type=\"core\">Ventilation ducts<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Accurate measurement of air flows in ducts<\/li>\n\n\n\n<li data-block-type=\"core\">Ensuring the removal of heat, cold and substances in the air<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-multi-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 &#8211; compact, versatile climate instrument<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/pressure-gauges\/differential-pressure-gauges\/testo-512-1-differential-pressure-meter-200-hpa\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 512-1 &#8211; compact, networked differential pressure meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-425-hot-wire-sensor-7-5-mm\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 425 &#8211; compact, connected hot-wire anemometer<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/wireless-measurement-kit-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo SmartProbes &#8211; set of wireless sensors<\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-columns are-vertically-aligned-top is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-vertically-aligned-top is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-417-4-ret_800x500.jpg\" alt=\"Air flow measurement with nozzle\" class=\"wp-image-35261\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-luftdon\" data-block-type=\"core\">Air diffuser<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Reliable measurement of volume flow according to EN 16211<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-417-wing-wheel-sensor-100-mm\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 417 &#8211; compact, connected wing wheel anemometer<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 dP &#8211; compact, versatile climate instrument<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/wireless-measurement-kit-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo SmartProbes &#8211; set of wireless sensors<\/a><\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top testo-160-hogerkolumn is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-512-1-clean-room-differential-pressure-V3_800x500.jpg\" alt=\"Pressure measurement with testo 512-1\" class=\"wp-image-35259\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-differenstryck\" data-block-type=\"core\">Differential pressure<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Measurement of negative or positive pressure in premises<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/pressure-gauges\/differential-pressure-gauges\/testo-512-1-differential-pressure-meter-200-hpa\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 512-1 &#8211; compact, networked differential pressure meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 dp &#8211; compact, versatile climate instrument<\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-420_p_ap_vel_005610_DE_RETOUCH_800x500.jpg\" alt=\"Air flow meter testo 420\" class=\"wp-image-35262\"\/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h3 class=\"wp-block-heading\" id=\"h-balanserade-ventilationssystem\" data-block-type=\"core\">Balanced ventilation systems<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Measuring the flow of supply air<\/li>\n\n\n\n<li data-block-type=\"core\">Checking air outflow in bathrooms and kitchens<\/li>\n\n\n\n<li data-block-type=\"core\">Check temperature and humidity<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-425-hot-wire-sensor-7-5-mm\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 425 &#8211; compact, connected hot-wire anemometer<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-420-volume-flow-hood-with-airflow-straightener\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 420 &#8211; smooth and super lightweight airflow nozzle<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-multi-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 &#8211; compact, versatile climate instrument<\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-columns thermalcolumns has-background is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" style=\"background-color:#8dd2fc29\" data-block-type=\"core\">\n<div class=\"wp-block-column is-vertically-aligned-center thermalcolumn-1 is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h3 class=\"wp-block-heading\" data-block-type=\"core\">Smart, free app for any measurement job.<br\/>Turns your mobile into a control center.<\/h3>\n\n\n\n<div class=\"wp-block-stackable-button-group stk-block-button-group stk-block stk-c9e2a74\" data-block-id=\"c9e2a74\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-button-group\">\n<div class=\"wp-block-stackable-button stk-block-button stk-block stk-b0c915f\" data-block-id=\"b0c915f\"><a class=\"stk-link stk-button stk--hover-effect-darken\" href=\"https:\/\/www.nordtec.se\/en\/testo-smart-apps\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"stk-button__inner-text\">Explore the testo Smart app<\/span><\/a><\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column thermalcolumn-2 is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/08\/Heating-2022-LP-App-800x450-1.jpg\" alt=\"testo Smart app\" class=\"wp-image-34566\"\/><\/figure>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-4e7e105\" data-block-id=\"4e7e105\"><style>.stk-4e7e105 {height:70px !important;}<\/style><\/div>\n\n<div class=\"wp-block-toolset-blocks-container tb-container vh_padding_fullbredd satisfied alignfull\" data-toolset-blocks-container=\"fb822330a9ad9b9fcc7a427bcd7c2b25\"><div class=\"tb-container-inner\">\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-070b085\" data-block-id=\"070b085\"><style>.stk-070b085 {height:50px !important;}<\/style><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-inneklimat-och-komfortniva\" data-block-type=\"core\"><span style=\"color: #000000;\" class=\"stk-highlight\">Indoor climate and comfort level<\/span><\/h2>\n\n\n\n<p>Here you will find measuring products to regularly measure and monitor the quality of the indoor climate and comfort level in all possible environments.<br\/>Accurate measurements enable precise settings of climate parameters, resulting in satisfied tenants and staff who perform at their best.<\/p>\n\n\n\n<div class=\"wp-block-group\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"499\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-400-Web-Images-Appl-hvacr-1-800x500px_im4c.jpg\" alt=\"Measurement of air quality\" class=\"wp-image-35162\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-inneklimat\" data-block-type=\"core\">Indoor climate<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Evaluate air quality by e.g. carbon dioxide measurement<\/li>\n\n\n\n<li data-block-type=\"core\">Carbon dioxide levels should not exceed 1000 ppm<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/environmental-instruments\/gas-meters\/testo-535-co2-meter\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 535 &#8211; compact, connected carbon dioxide meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 dP &#8211; compact, versatile climate instrument<\/a><\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center testo-160-hogerkolumn is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"499\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-400-Web-Images-Appl-hvacr-2-800x500px_im4c.jpg\" alt=\"Measurement of turbulence level\" class=\"wp-image-35161\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-turbulensniva\" data-block-type=\"core\">Turbulence level<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Provides indication of air change and intensity of air flows<\/li>\n\n\n\n<li data-block-type=\"core\">Accurate measurements of air temperature and turbulence<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 dP &#8211; compact, versatile climate instrument<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-velocity\/fixed-cable-pullers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Strain gauge &#8211; turbulence measurement with testo 400\/testo 440<\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-columns column-reverse is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h3 class=\"wp-block-heading\" id=\"h-temperatur-och-luftfuktighet\" data-block-type=\"core\">Temperature and humidity<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Recommended relative humidity: 30 % to 65 %.<\/li>\n\n\n\n<li data-block-type=\"core\">Assessment of average climate value<\/li>\n\n\n\n<li data-block-type=\"core\">In accordance with ISO 7730<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/moisture-meters\/humidity-meter\/testo-605i-wireless-moisture-and-temperature-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 605i &#8211; versatile moisture and humidity\/temperature sensors<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/moisture-meters\/humidity-meter\/testo-625-moisture-and-temperature-meter\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 625 &#8211; compact, connected moisture\/temperature meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/?post_type=product&amp;p=40774\" target=\"_blank\" rel=\"noreferrer noopener\">Measurement set temp\/humidity &#8211; with the testo 174H mini data logger<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/moisture-meters\/humidity-meter\/testo-608-h1-hygrometer-for-the-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 608-H1 &#8211; humidity\/temperature\/dew point hygrometer<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/moisture-meters\/humidity-meter\/testo-440-moisture-measurement-kit\/\" target=\"_blank\" rel=\"noreferrer noopener\">Moisture measurement set &#8211; testo 440 and Bluetooth wireless sensor<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measurement-systems\/celsicom-en\/celsicom-t600-internal-temperature-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\">Celsicom T600 &#8211; compact, connected temperature meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measurement-systems\/celsicom-en\/celsicom-th600-internal-temperature-and-humidity-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\">Celsicom TH600 &#8211; compact, connected temp\/humidity meter<\/a><\/p>\n<\/div><\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-623-Indoor-Air-Quality_im4c_500x500.jpg\" alt=\"Measurement of temperature and humidity\" class=\"wp-image-35160\"\/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"499\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-400-Web-Images-Appl-hvacr-3-800x500px_im4c.jpg\" alt=\"Measurement of thermal radiation\" class=\"wp-image-35159\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-varmestralning\" data-block-type=\"core\">Thermal radiation<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">The WBGT index is used to evaluate workplaces affected by thermal radiation.<\/li>\n\n\n\n<li data-block-type=\"core\">In accordance with DIN 33403 and ISO 7243<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 440 dP &#8211; compact, versatile climate instrument<\/a><\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center testo-160-hogerkolumn is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"499\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-400-Web-Images-Appl-hvacr-4-800x500px_im4c.jpg\" alt=\"Measurement of comfort level\" class=\"wp-image-35158\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-komfortniva-pmv-ppd\" data-block-type=\"core\">Comfort level (PMV\/PPD)<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">All parameters included in a PMV\/PPD measurement<\/li>\n\n\n\n<li data-block-type=\"core\">Assessment of average climate value<\/li>\n\n\n\n<li data-block-type=\"core\">In accordance with ISO 7730<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 400 &#8211; smart multi-instrument for climate measurement<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/climate-instrument\/testo-440-dp-indoor-climate-measurement-kit\/\" target=\"_blank\" rel=\"noreferrer noopener\">Comfort level measurement kit &#8211; testo 440, carbon dioxide\/globe\/turbulence sensor<\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-545-lux-meter-V3_800x500.jpg\" alt=\"Measurement of brightness\" class=\"wp-image-35260\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-ljus\" data-block-type=\"core\">Light<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Measurement and assessment of light intensity (natural or artificial light)<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/environmental-instruments\/light-meters-en\/testo-545-lux-meter\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 545 &#8211; digital, connected lux meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/environmental-instruments\/light-meters-en\/testo-540-pocket-sized-light-meter\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 540 &#8211; pocket-sized lux meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 160 THL &#8211; wifi data logger, sensors for lux, UV, etc.<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/environmental-instruments\/light-meters-en\/testo-440-lux-measurement-kit-for-light-measurement\/\" target=\"_blank\" rel=\"noreferrer noopener\">Measurement set &#8211; testo 440 and lux sensor with cable<\/a><\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-top testo-160-hogerkolumn is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"499\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/testo-816-1-application-sound-004433_im4c_800x500.jpg\" alt=\"Measurement of sound level\" class=\"wp-image-35156\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-ljud\" data-block-type=\"core\">Sound<\/h3>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Clarifying the sound environment in homes and workplaces<\/li>\n\n\n\n<li data-block-type=\"core\">Detect unwanted, disturbing sounds from equipment or people<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group lanklista\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-400-climate-instrument-for-ventilation-and-indoor-climate\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 815 &#8211; simple and accurate decibel meter<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/ventilation-instruments\/air-flow-meters\/testo-440-dp-multi-instrument-with-differential-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">testo 816-1 &#8211; decibel meter with integrated memory<\/a><\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-d055031\" data-block-id=\"d055031\"><\/div>\n\n<div class=\"wp-block-columns testo565i-column column-reverse is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h2 class=\"wp-block-heading\" id=\"h-praktisk-inspektionskamera\" data-block-type=\"core\">Practical inspection camera.<\/h2>\n\n\n\n<p>The testo 318 is a high-end inspection camera that enables easy optical troubleshooting and smooth removal of obstacles in hard-to-reach places.<\/p>\n\n\n\n<ul class=\"wp-block-list\" data-block-type=\"core\">\n<li data-block-type=\"core\">Easy identification of objects and hidden obstacles<\/li>\n\n\n\n<li data-block-type=\"core\">Large color display (2.4&#8243;)<\/li>\n\n\n\n<li data-block-type=\"core\">Rotatable camera with 9 mm (0.35&#8243;) diameter<\/li>\n\n\n\n<li data-block-type=\"core\">Flexible, waterproof gooseneck probe (1 m)<\/li>\n<\/ul>\n\n\n\n<p><strong><a href=\"https:\/\/www.nordtec.se\/en\/product\/measuring-instruments\/inspection-instruments-en\/testo-318-endoscope-camera-for-inspection\/\">Read more here<\/a><\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"534\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2024\/12\/testo-318-anwendung-01_800x534px.jpg\" alt=\"Application picture testo 318\" class=\"wp-image-50153\"\/><\/figure>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-toolset-blocks-container tb-container vh_padding_fullbredd satisfied kalibreringsblock alignfull\" data-toolset-blocks-container=\"ed3dc6afb1f11aaaee89700297e99c81\"><div class=\"tb-container-inner\">\n<div class=\"wp-block-group\" data-block-type=\"core\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-columns column-reverse is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" data-block-type=\"core\">\n<div class=\"wp-block-column is-vertically-aligned-center testo-160-hogerkolumn is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h2 class=\"wp-block-heading\" id=\"h-kalibrering-visar-dina-riktiga-matvarden\" data-block-type=\"core\">Calibration shows your &#8220;real&#8221; readings<\/h2>\n\n\n\n<p>Don&#8217;t forget to calibrate your measuring equipment. It provides answers to how your measured values relate to values from highly accurate reference equipment. And at the same time it means that you meet the Swedish Food Agency&#8217;s requirements and the criteria for ISO certifications. We offer accredited calibration of a large number of measured variables. Choose between lab or field calibration.<\/p>\n\n\n\n<div class=\"wp-block-stackable-button-group stk-block-button-group stk-block stk-9c37078\" data-block-id=\"9c37078\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-button-group\">\n<div class=\"wp-block-stackable-button stk-block-button knallrod stk-block stk-6f90eca\" data-block-id=\"6f90eca\"><a class=\"stk-link stk-button stk--hover-effect-darken\" href=\"https:\/\/www.nordtec.se\/en\/calibration\/\"><span class=\"stk-button__inner-text\">Read more and book calibration<\/span><\/a><\/div>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-3d4b7c4\" data-block-id=\"3d4b7c4\"><style>.stk-3d4b7c4 {height:30px !important;}<\/style><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full grey-block-image\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/08\/Nordtec-faltkalibrering_800x500px.jpg\" alt=\"Field calibration\" class=\"wp-image-34475\"\/><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-2bc2361\" data-block-id=\"2bc2361\"><\/div>\n\n<div class=\"wp-block-columns thermalcolumns has-background is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\" style=\"background-color:#8dd2fc29\" data-block-type=\"core\">\n<div class=\"wp-block-column is-vertically-aligned-center thermalcolumn-1 is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<h2 class=\"wp-block-heading\" data-block-type=\"core\">Localize energy losses and overheating.<\/h2>\n\n\n\n<p><strong><span style=\"color: #000000;\" class=\"stk-highlight\">Learn more about thermography and find the thermal imaging camera that suits your needs.<\/span><\/strong><\/p>\n\n\n\n<div class=\"wp-block-stackable-button-group stk-block-button-group stk-block stk-ad1b1e5\" data-block-id=\"ad1b1e5\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-button-group\">\n<div class=\"wp-block-stackable-button stk-block-button stk-block stk-6ad2b99\" data-block-id=\"6ad2b99\"><a class=\"stk-link stk-button stk--hover-effect-darken\" href=\"https:\/\/www.nordtec.se\/en\/sectors-and-areas\/presentation-of-thermal-cameras\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"stk-button__inner-text\">Explore our thermal imaging cameras<\/span><\/a><\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column thermalcolumn-2 is-layout-flow wp-block-column-is-layout-flow\" data-block-type=\"core\">\n<figure class=\"wp-block-image size-full\" data-block-type=\"core\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/Building-2023-KeyVisual_800x500.jpg\" alt=\"Combined thermal image and regular image\" class=\"wp-image-35155\"\/><\/figure>\n<\/div>\n<\/div>\n\n<div class=\"wp-block-stackable-spacer stk-block-spacer stk--no-padding stk-block stk-b4b8300\" data-block-id=\"b4b8300\"><\/div>\n\n<script src=\"https:\/\/js-eu1.hsforms.net\/forms\/embed\/145724260.js\" defer=\"defer\"><\/script>\n<div class=\"hs-form-frame\" data-region=\"eu1\" data-form-id=\"c8086cf5-0700-4b8c-902e-96a249e7ea70\" data-portal-id=\"145724260\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>VENTILATION AND INDOOR CLIMATE The road to a good climate, low energy losses and good operating economy Service technicians and facility managers face a number of challenges on a daily basis. It is about ensuring good ventilation and comfortable temperatures &#8211; while minimizing the risks of costly leaks and unhealthy indoor environments. We have a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":41569,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-fullwidth.php","meta":{"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","footnotes":""},"class_list":["post-41571","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ventilation and indoor climate | Nordtec<\/title>\n<meta name=\"description\" content=\"We have a wide range of flexible and accurate handheld instruments for measuring various quantities and conditions that affect the indoor climate.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nordtec.se\/en\/sectors-and-areas\/ventilation-and-indoor-climate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ventilation and indoor climate\" \/>\n<meta property=\"og:description\" content=\"We have a wide range of flexible and accurate handheld instruments for measuring various quantities and conditions that affect the indoor climate.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.nordtec.se\/en\/sectors-and-areas\/ventilation-and-indoor-climate\/\" \/>\n<meta property=\"og:site_name\" content=\"Nordtec\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/nordtecinstrument\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-15T14:25:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.nordtec.se\/wp-content\/uploads\/2023\/09\/toppbild_ventilation-inneklimat_2000x350.jpg\" \/>\n\t<meta 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