The testo 400 universal IAQ instrument enables precise measurement and monitoring of all relevant climate parameters, including temperature, humidity, air velocity and air quality in just one instrument. This versatility makes it a suitable tool for professionals in cleanroom monitoring, laboratory environments and other industries where accurate climate measurement is required.

High-precision sensors and intelligent probe concept

Thanks to its high-precision sensors and intelligent probe concept, the testo 400 offers outstanding measurement accuracy. The digital probe technology enables precise data acquisition and processing directly in the probe, which minimizes the measurement uncertainty of the instrument. This concept also simplifies calibration, as only the probe needs to be sent to the calibration laboratory, while the instrument remains ready for use.

Ideal for all measurements in and around the cleanroom

The testo 400 is particularly suitable for measurements in and around cleanrooms. It enables the measurement of volume flows in the duct, at the diffuser and at fume cupboards, ensuring comprehensive air flow monitoring in clean rooms and similar environments. The optional use of accessories such as the 100mm impeller or the testo 420 volume flow measuring hood enables precise and reliable measurement, even in demanding situations.