Standard-compliant volume flow measurement

With the universal IAQ instrument, you can measure volume flows in ducts and at outlets efficiently, intuitively, and in compliance with standards.

  • Interactive guided measurement menus
    The testo 400 helps you to work in compliance with DIN EN 12599 or ASHRAE 111. It guides you step by step through the measurement, reliably preventing any incorrect measurements from being made.
  • Convenient measurement
    Telescopes with easy-to-read scaling make it really convenient for work in ducts. 
  • Efficient data management
    Customer and measuring point information can be transferred from software allowing complex series of measurements to be conveniently analysed on a PC down to the very last detail.
  • Intelligent calibration concept
    The adjustment function allows you to store the calibration deviations determined during calibration at up to six measuring points in the digital probe. This gives you a zero-error display.

Would you welcome some advice?

In the online configurator, you can find out quickly and easily which combination of measuring instrument, probe and accessories best suits your requirements.

Professional, standard-compliant, and convenient determination of the volume flow

  • In the duct by means of grid measurement in accordance with EN ISO 12599 and ASHRAE 111
  • At the outlet with the extendible telescope (2 m)
  • For turbulent flows with the right flow straightener
  • NEW: measure even at large outlets using the testo volume flow hood. Find out more.

 

How to contact us.

Do you have any questions?
We would be more than happy to help you.

Kits and probes for carrying out measurements in ducts and at outlets

testo 400 Air flow kit with hot wire probe

testo 400 air flow kit with hot wire probe
To the kit
  • testo 400 with case
  • Hot wire probe with Bluetooth, including temperature and humidity sensor
  • Vane probe head (Ø 100 mm), including temperature sensor
  • High-precision humidity/temperature probe head
  • 90° angle for connecting vane probes (Ø 100 mm)

testo 400 Air flow kit with 16 mm vane probe

testo 400 air flow kit with 16 mm vane probe
To the kit
  • testo 400 with case
  • Vane probe (Ø 16 mm) with Bluetooth, including temperature sensor
  • Vane probe head (Ø 100 mm), including temperature sensor
  • High-precision humidity/temperature probe head
  • 90° angle for connecting vane probes (Ø 100 mm)

testo 420 volume flow hood
 

testo 420 volume flow hood
To the product
  • Flow hood for larger ceiling vents
  • Measurement of volume flow, temperature and relative humidity
  • Impressively lightweight at just 2.9 kg
  • Convenient operation, measurement and customer data management and logging with the testo 400

     

 

More probes and accessories
 

testo 400 probes and accessories
More
Fully exploit the potential of the testo 400.

Volume flow measurement in ducts and at outlets

NEW: Measure at large outlets using the testo 400 and testo 420

Valuable measuring facts about testo 400

Overview of the measurement menus

Which stored measurement menus in the testo 400 can assist you with volume flow measurements?

testo 400 brochure

Everything you need to know about the testo 400 universal IAQ instrument in one concise brochure.

Quick Guide
testo 400 and testo 420

Measure at large outlets using the testo 400 and testo 420.

These might also interest you