The universal air velocity & IAQ measuring instrument testo 400

With the testo 400 we introduce you to the new generation of of air flow and IAQ measurement technology.
Thanks to numerous innovations and smart technology it makes carrying out all measurement tasks in the ventilation and air conditioning sector easier and less complicated for you than ever before:

The testo 400 is an all-rounder with a wide range of probes, suitable for all applications in the air conditioning and ventilation sector.
The integrated measurement assistant with its numerous measuring programs supports the user with each measurement and ensures that they are both error-free and (if required) even norm-compliant.
Documentation and measurement data management can be carried out directly on site. For detailed analysis and reporting, the software testo DataControl is included in delivery.
With its smart touch operation and robust design the testo 400 air flow and IAQ measurement measuring device prevails in everyday work.
We are convinced that the testo 400 is smarter, faster and better. Discover the advantages of the newest air flow and IAQ measurement technology now!

Brochure testo 400

testo 400 brochure
All information on the measuring instrument, probes and accessories in a compact download.
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Fast on
Fast on
Simply exchange probes during the measurement without a re-start. 
Measurement assistant
Measurement assistant
Smart support for error-free measurement. 
Universally applicable
Universally applicable
Wide range of probes for all of your air flow & IAQ measurements. 
Always ready to go
Always ready to go
Probes can be calibrated independently of the measuring instrument. 
Saving time
Saving time
Finish measurement with complete documentation directly on site with the customer. 

SMARTER

> With its Smart-Touch display as intuitive to operate as your smartphone.

Click now to see how the testo 400 works!

With an intuitive touch display
and intelligently designed operation,
the testo 400 helps you
to carry out all measurements
faster and more efficiently
than ever before.

testo-400-Klickdummy_Image01_2000x1500px.jpg
IAQ measuring instrument with touch operation
IAQ measuring instrument with touch operation



 

The testo 400 has a display with smart-touch technology. As a result, you can operate the climate measuring device just as intuitively as your smartphone and view all measured data instantly and clearly.

testo 400 touch display operation

FASTER

> Save time in documentation and measurement data management.

Data management and analysis with the testo 400

With the testo 400, you can now carry out worksteps which were previously only possible with a PC and software. The measurement can be finished directly on site with complete documentation and report creation directly on site - with just one measuring instrument.

The software testo Data Control is available for subsequent detailed analysis and reporting.

Professional reports

Create reports on site with all relevant data, images and comments.

Send data right away

Send the measurement results by WiFi/ Bluetooth.

All customers and sites

Save, manage and re-use customers and measurement sites directly in the measuring instrument or via the analysis software testo Data Control.

Large 1.3 GB memory

Securely store > 1 million measurement values in the memory of the instrument.

BETTER

> Error-free results with the measurement data assistant.

With the climate measuring instrument testo 400 you can measure:

  • error-free
  • routinely
  • norm-compliant

Select one of the numerous measuring programs. The measurement data assistant guides you step by step through the measurement process.

Examples - how the measurement assistant supports you in

  • IAQ measurement according to EN12599:
    Configuration: Input of duct geometry, apertures and measurement points, calculation of measurement depths
    Measurement: Graphically guided measurement with all relevant measurement points
    Result: Statement of volume flow and the exact measurement inaccuracy
  • PMV/PPD measurement in accordance with EN ISO 7730:
    Configuration: Determination of clothing index and activity
    Measurement: Parallel measurement of ambient and radiated temperatures, flow velocity and relative humidity
    Result: Statement as a PMV/PPD curve including evaluation
  • Turbulence measurement according to DIN EN 7730:
    Configuration: Allocation of probes to measurement positions
    Measurement:Simultaneous measurement at three heights according to norm
    Result: Statement of measurement values at all heights as a value, table and graph.

What do you need to measure?

Application videos: the testo400 in practice.

Volume flow measurement in ducts and at outlets

Comfort measurement (PMV/PPD)

Long-term measurement with the testo 400 and IAQ data logger

Measurements in a cleanroom

All testo 400 measurement menus.

testo 400 measurement
The testo 400 supports your daily work with these measurement menus.

Click now to see how the testo 400 works!

With an intuitive touch display
and intelligently designed operation,
the testo 400 helps you
to carry out all measurements
faster and more efficiently
than ever before.

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testo-400-Klickdummy_1_Start-Ansicht_unten.jpg
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smarttouchbutton.png
Play
Play
 
Stop
Stop
 

testo 400 – the multitasker for IAQ professionals

  • Measures all IAQ-related parameters: Flow, temperature, humidity, pressure, illuminance, radiant heat, turbulence, CO₂ and CO
  • High-precision, location-independent and integrated differential pressure sensor
  • High-quality digital probes and an intelligent calibration concept
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testo-400-Klickdummy_2_Basic-View_unten_EN.jpg
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Smart support through stored measurement menus and evaluation of measuring values according to the traffic light principle – for error-free measurements

  • HVAC grid measurement in accordance with EN ISO 12599 and ASHRAE 111
  • PMV/PPD in accordance with EN ISO 7730 and ASHRAE 55
  • Draught and degree of turbulence in accordance with EN ISO 7730 and ASHRAE 55
  • WBGT measurement in line with DIN 33403 and EN ISO 7243, NET measurement in accordance with DIN 33403
testo-400-Klickdummy_3_Hauptmenue_oben_EN.jpg
testo-400-Klickdummy_3_Hauptmenue_unten_EN.jpg
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Determination of volume flow in ducts using grid measurement in accordance with EN 12599

  • For all flow velocity probes (hot wire, vane) and Pitot tubes
  • Input of duct geometry and duct apertures
  • Single-point or timed measurement
  • Calculation of measurement uncertainty according to EN 12599
  • Automatic display of insertion depths for traversing duct
  • Duct distribution for rectangular ducts according to the trivial method, and for circular ducts according to the centroidal axis method.
testo-400-Klickdummy_4_Messprogramm_oben_EN.jpg
testo-400-Klickdummy_4_Messprogramm_unten_EN.jpg

Determination of volume flow in ducts using grid measurement in accordance with EN 12599

  • For all flow velocity probes (hot wire, vane) and Pitot tubes
  • Input of duct geometry and duct apertures
  • Single-point or timed measurement
  • Calculation of measurement uncertainty according to EN 12599
  • Automatic display of insertion depths for traversing duct
  • Duct distribution for rectangular ducts according to the trivial method, and for circular ducts according to the centroidal axis method.
testo-400-Klickdummy_5_RLT-Netzmessung(1)_oben_EN.jpg
testo-400-Klickdummy_5_RLT-Netzmessung(1)_unten_EN.jpg

Determination of volume flow in ducts using grid measurement in accordance with EN 12599

  • For all flow velocity probes (hot wire, vane) and Pitot tubes
  • Input of duct geometry and duct apertures
  • Single-point or timed measurement
  • Calculation of measurement uncertainty according to EN 12599
  • Automatic display of insertion depths for traversing duct
  • Duct distribution for rectangular ducts according to the trivial method, and for circular ducts according to the centroidal axis method.
testo-400-Klickdummy_6_RLT-Netzmessung(2)_oben_EN.jpg
testo-400-Klickdummy_6_RLT-Netzmessung(2)_unten_EN.jpg

Work efficiently on site – no workarounds, just on to the next job

  • Manage all relevant customer data including measurement locations directly in the instrument
  • Complete and send measuring values with full documentation, including photos, comments and your own logo directly on site – and get to the next job faster
testo-400-Klickdummy_7_Protokoll-Ansicht_oben_EN.jpg
testo-400-Klickdummy_7_Protokoll-Ansicht_unten_EN.jpg
testo-400-Klickdummy_Image04_2000x1500px.jpg

Work efficiently on site – no workarounds, just on to the next job

  • Manage all relevant customer data including measurement locations directly in the instrument
  • Complete and send measuring values with full documentation, including photos, comments and your own logo directly on site – and get to the next job faster
testo-400-Klickdummy_8_Protokoll-Ansicht_oben_EN.jpg
testo-400-Klickdummy_8_Protokoll-Ansicht_unten_EN.jpg
testo-400-Klickdummy_Image04_2000x1500px.jpg