testo 400 – climate instrument for ventilation and indoor climate

Climate instrument for all ventilation and indoor climate professionals with a large touch screen.

  • Shows the air flow rate in l/s or m3/h
  • Integrated rear/front cameras (8 megapixel / 5 megapixel)
  • Highly accurate and position-independent differential pressure sensor
  • High quality digital sensors, both wireless and wired.

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Finns i lager

Finns i lager

testo 400 – climate instrument for ventilation and indoor climate professionals

The new generation of climate instruments. Smarter. Faster. Better.

The versatile testo 400 climate instrument and the wide range of precision sensors were developed with one goal in mind: to make all measurement tasks in the field of ventilation easier and less complicated than ever before.

With the testo 400 you can perform tasks that were previously only possible with a PC and software – directly on site with just one measuring instrument!

With testo 400, you always have your own personal assistant with you. The more demanding the measurement, the more support you get from the help functions in setting, measuring and evaluating the results.

Advantages of the testo 400

  • Smart user support with ready-made measurement menus and measurement value analysis with traffic light principle – for error-free measurements.
  • Manage all relevant customer data including measurement points directly in the instrument – work efficiently and directly at the measurement site.
  • Conclude the assignment by sending a report with full documentation, including a copy of the report. photos, comments and your own logo directly on the site – get to the next job faster.
  • The sensor can be changed without restarting the instrument – easy handling without losing time.
  • The digital sensors can be calibrated completely independently of the measuring instrument. This means that you can continue to use the instrument with other sensors.
  • The handy service bag provided includes molded slots for specific sensors and accessories.

So, as a consultant, expert or service technician in the ventilation sector, the testo 400 will help you carry out your measurement tasks quickly and efficiently. Relevant quality parameters in industrial production and manufacturing processes can also be checked reliably and accurately with the testo 400.

Maximum airflow measurement

  • If you want to see the air flow rate in l/s or m3/h, the instrument can easily calculate and display this according to current standards.
  • You always have all measurement sites with you, ready to use
  • Bluetooth wireless sensors for maximum freedom of movement at work
  • Easily conclude with a finished report directly on site

Maximized measurement in laboratories, cleanrooms and industry

  • Help function for PMV/PPD measurements and determination of draft levels
  • IAQ data logger (optional) for long-term measurement of indoor climate, independent of the instrument
  • Complete the report either directly on site or later on a PC.

Maximum comfort level measurement

  • Highest precision, especially for pressure and temperature measurements
  • View all measurements in table and chart format
  • Zero error adjustment in the instrument for even more accurate measurements

Common sensor range with testo 440

The sensor range of the versatile testo 400 climate instrument is shared with the testo 440. This means you can add to your toolbox as you go along and don’t need to buy new sensors if you invest in both instruments.

The delivery includes

Climate instrument testo 400 for ventilation and indoor climate, service bag for air flow measurement, PC program testo DataControl, connection hose, power supply unit with USB cable and factory protocol.

Download the testo DataControl from the“Download” tab.

Fabriksprotokoll: utfärdas på fabriken efter en kontroll av att produkten fungerar och uppfyller angiven mätnoggrannhet. Läs om skillnaden mellan fabriksprotokoll och ackrediterad kalibrering.

OBS! Givare ingår inte. Välj en givare som uppfyller dina krav från vårt breda sortiment under fliken ”Givare”.


Measurable parameters with external sensors (optional)Air flow, air speed, draft, degree of turbulence, temperature, humidity, pressure, brightness, radiant heat, turbulence, CO2 and CO
Measurement range-10,000 … +20,000 Pa
Accuracy (±1 digit)±(0.3 Pa ± 1 % of m.v.) (0 … 2,500 Pa)

±(10 Pa + 1.5% of m.v.) (2,500 … 20,000 Pa)
Resolution0.1 Pa
ABSOLUTE PRESSURE (internal sensor)
Measurement range700 … +1,100 hPa
Accuracy (±1 digit)±3 hPa
Resolution0.1 hPa
TEMPERATURE NTC (with suitable sensor)
Measurement range-40 … +150 °C
Accuracy (±1 digit)±0.2 °C (-25 … 74.9 °C)

±0.4 °C (-40 … -25.1 °C)

±0.4 °C (+75 … +99.9 °C)

±0.5% of m.v. (other measuring range)
Resolution0.1 °C
TEMPERATURE TE TYPE K (with suitable sensor)
Measurement range-200 … +1370 °C
Accuracy (±1 digit)±(0.3 °C + 0.1% of mv.)
Resolution0.1 °C
TEMPERATURE Pt100 (with suitable sensor)
Measurement rangeSee probe data
Accuracy (±1 digit)See probe data
ResolutionSee probe data
Sensor connections4 pcs Bluetooth®, 2 pcs TUC*, 2 pcs TE type K
ConnectionsBluetooth®, WLAN, USB
Operating temperature-5 … +45 °C
Storage temperature-20 … +60 °C
Power supplyRechargeable li-ion battery
(5550 mAh)
Battery lifeabout 10 hours of continuous operation
Display5-inch HD display
1280 x 720 px resolution
CameraMain camera: 8.0 MP

Front camera: 5.0 MP
Memory2 GB (equivalent to approx. 1,000,000 measurements)
Protection classIP40
Measure210 x 95 x 39 mm
* TUC connection (Testo Universal Connector): For connecting digital sensors with fixed cable and NTC sensors.

Digital air velocity probes

Digital comfort level probes

Digital moisture probes

Digital CO probes

Digital temperature probes

NTC probes with TUC connector

Thermocouple probes type K

testo SmartProbes

Pitot tubes (prandtl tubes)


Datablad testo 400

testo DataControl till testo 400

testo DataControl till testo 400 kan användas för kund- och mätplatshantering och har avancerade analys- och arkiveringsfunktioner. Om du redan har en befintlig version installerad på din PC, kommer den att uppdateras till den senaste versionen.


I de flesta Windows-versioner laddas filer ned till en mapp med namnet ”Hämtade filer” eller ”Download”. Flytta den nedladdade ZIP-filen till C:/temp eller direkt till C:/ och packa upp den. Högerklicka sedan på EXE-filen och välj ”Kör som administratör”. Då påbörjas installationen atuomatiskt. När allt är klart ska det ha skapats en Testo-mapp i startmenyn, där du hittar den nya programikonen.

Skriv din fråga i det här fältet.

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testo 440 dP – multi-instrument with differential pressure

Multi-instrument with integrated differential pressure sensor

  • Display airflow in l/s or m3/h
  • Clearly structured measurement menus
  • Report function
  • Wide range of digital sensors, both wireless and wired.