Climate measurement improved to the maximum.
The universal air velocity & IAQ measuring instrument testo 400
The universal air velocity & IAQ measuring instrument testo 400
One measuring instrument for all climate-related parameters
The right probe to hand for every application: Flexible, mutually compatible Bluetooth and cable probes for measuring all climate-relevant parameters
Intelligent calibration concept: Calibration of the probes or probe heads independent of the measuring instrument
Individual applications
What would you like to measure? Find out about your individual application area here.
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
Smart support
Stored measurement menus and evaluation of measurement values according to the traffic light principle – for error-free measurements.
VAC grid measurement as per EN ISO 12599
PMV/PPD in accordance with EN ISO 7730
Draught and degree of turbulence in accordance with EN ISO 55
WBGT measurement in line with DIN 33403 and EN ISO 7243
NET measurement in accordance with DIN 33403
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
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
Calculation of measurement uncertainty according to EN 12599
Work efficiently on site – no workarounds, just on to the next job
Manage and save all relevant customer data including measurement locations directly on 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
Customer testimonials for testo 400
For us as a technical service provider for air conditioning and ventilation systems, testo 400 is our preferred instrument with its versatility and convenient data management functionalities. It's very easy to use and most importantly, provides reliable readings.
Jean-Marie Leroy
·France
We use testo 400 to determine reliable precise results of the indoor climate. Here the measuring programs for PMV/PPD and draught rate are already stored in the instrument. The flexible attachment of various probes is another plus point of the testo 400 for me. If my applications expand in the future, I can simply purchase additional probes. If a probe breaks or needs calibration, I can send it to the service department separately and continue to use the measuring instrument in the meantime.
Wolfgang Lochner
·Germany
The testo 400 IAQ measuring instrument makes you a measurement data billionaire. With its vast memory, we don't have any more headaches about data management and documentation.
Omar El Masry
·England
The wireless probes are designed with touch display and magnetic mounts for easy attaching to ducts. In addition, the high accuracy of the instrument and accessories are crucial for the pharmaceutical customers we support as a service provider for technical facility management.
Annette Groth
·Germany
Product video
The universal air velocity & IAQ measuring instrument testo 400 with smart touch technology.