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 duct grid measurement in accordance with EN ISO 12599 and ASHRAE 111
- At the outlet with the extendible telescope (6.5 feet)
- For turbulent flows with the right flow straightener
- NEW: measure even at large outlets using the testo volume flow hood. Find out more.
Kits and probes for carrying out measurements in ducts and at outlets
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 4 in), including temperature sensor
- 90° angle for connecting vane probes
testo 400 IAQ kit
To the kit
- testo 400 with case
- CO probe with Bluetooth
- CO2 probe, including temperature and humidity sensor
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 6.4 lb
- Convenient operation, measurement and customer data management and logging with the testo 400
More 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
Guide: Measurements in ducts
How to take proper air flow measurements in ducts in compliance with DIN EN 12599.
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.
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