The universal air velocity & IAQ measuring instrument testo 400


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Smarter. Faster. Better: The new generation of air flow and IAQ measurement technology

Thanks to its easy handling, it is more convenient than ever before to carry out all measurement tasks in air conditioning and ventilation.
Intuitive operation

Everything under control at the touch of a finger

You operate the testo 400 with its Smart-Touch technology just as intuitively as your smartphone.

Wireless measurement

Wireless measurement with one click

You simply start and stop measurements with just one button on the probe handle.
Broad range of probes

Always have the right probe at your fingertips

Die neuen flexiblen Bluetooth- und Kabelsonden sind vollständig miteinander kompatibel.
With the testo 400, you save time and deal with customer administration and reporting directly on site, whereas previously this was only possible with software and a PC.
Mobile customer directory

Customers and measuring points are always at hand

You can save data directly in the measuring instrument, manage them and re-use them for repeated measurements.
Digital reporting

Beat the paperwork

Create professional reports, with data, images and comments on site and send them directly by WLAN/Bluetooth.
Incl. DataControl Software

The App for your PC

The measurement data management and analysis software testo DataControl for the most detailed analysis and reporting in the office is included in delivery.
The more demanding the measurement, the more the integrated measurement assistant supports you in configuration, implementation and analysis - for error-free results.
Norm-compliant IAQ measurements

IAQ measurements according to EN12599 and ASHRAE 111

Norm-compliant PMV-/PPD measurements

PMV/PPD measurement in accordance with EN ISO 7730 and ASHRAE 55

Norm-compliant degree of turbulence measurements

Turbulence measurement in accordance with EN ISO 7730

Individual applications

See for yourself how the testo 400 can make your job easier.


Download:Overview of all measurement menus in the measurement assistant

testo 400 measurement
Find out how the integrated measurement assistant supports you thanks to pre-configured measurement programmes.

Download: testo 400 brochure

testo 400 brochure
All information on the measuring instrument, probes and accessories in a compact download.