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Universal IAQ Instrument (testo 400)

5 out of 5

Smart, intuitive measurement programs including HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD and turbulence as per EN ISO 7730 and ASHRAE 55.

High-precision, location-independent and integrated differential pressure sensor

Smart, intuitive measurement programs including HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD and turbulence as per EN ISO 7730 and ASHRAE 55

Document measuring values directly on the customer’s site and send them by e-mail, or further analyze them using the testo Data Control PC software.


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As an expert in the field of air conditioning and ventilation, you will find the testo 400 universal IAQ measuring instrument ideal. The IAQ measuring instrument with a built-in measurement assistant provides optimum support for carrying out air flow and comfort level measurements in accordance with the standards, as well as for adjusting and inspecting air conditioning and ventilation systems. testo 400 universal IAQ instrument – features Impressive IAQ measurement technology High-precision, location-independent, built-in differential pressure sensor Integrated absolute pressure sensor Measures all IAQ-related parameters: Flow, temperature, humidity, pressure, illuminance, radiant heat, turbulence, CO 2 and CO Numerous connection options for probes: 2 x cable probes (TUC), 4 x Bluetooth ® probes, 2 x type K thermocouple probes Compatible with a wide range of available Bluetooth ® and cable probes – so you’ll be equipped for any measuring task For high-precision measurements and less downtime: Adjustment function at up to six measuring points for zero-error display, probe heads can be replaced without restarting the IAQ measuring instrument, high-quality probes with an intelligent calibration concept (probe calibration independent of the measuring instrument) Long-term monitoring of the indoor air quality: Order the IAQ data logger for carrying out long-term measurements with the testo 400 IAQ measuring instrument. While the stand-alone data logger is carrying out the IAQ measurement, you can use the IAQ measuring instrument for measurements elsewhere Smart, intuitive, practical: Measurement programs, measurement data management and operation For error-free measurements in accordance with the standards: Smart, intuitive measurement menus and evaluation of readings according to the traffic light principle provide optimum support for your measuring task. Use the measurement programs for standard-compliant measurements: HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD as per EN ISO 7730 and ASHRAE 55, draught and turbulence as per EN ISO 7730 and ASHRAE 55, WBGT measurement as per DIN 33403 and EN ISO 7243, NET measurement as per DIN 33403 Complete the measurement and full documentation including photos, comments and your own logo on site at the customer’s premises, and send by e-mail (via WLAN) Customer and measuring point management is carried out in the measuring instrument itself – for efficient work on site Smart-touch display for intuitive operation of the IAQ measuring instrument testo Data Control PC software for further analysis, archiving and documentation of measurement data on your computer Built-in WLAN and Bluetooth ® interfaces: Send measurement reports directly on site or print them out with a suitable printer.


1 x testo 400 universal IAQ instrument, including transport case for air flow measurements, testo Data Control software, connection hose, mains unit with USB cable, calibration protocol and instruction manual.

Technical Data

Temperature – NTC
Measuring range

-40 to +150 °C


±0.2 °C ±1 Digit (-25 to +74.9 °C)

±0.4 °C ±1 Digit (-40 to -25.1 °C)

±0.4 °C ±1 Digit (+75 to +99.9 °C)

±0.5 % of mv ±1 Digit (Remaining Range)


0.1 °C

Temperature – TC Type K (NiCr-Ni)
Measuring range

-200 to +1370 °C


±(0.3 °C + 0.1 % of mv) ±1 Digit


0.1 °C

Differential pressure (internal sensor) – Piezoresistive
Measuring range

-100 to +200 hPa


±(0.3 Pa + 1 % of mv) ±1 Digit (0 to 25 hPa)

±(0.1 hPa + 1.5 % of mv) ±1 Digit (25.001 to 200 hPa)


0.001 hPa

Absolute Pressure (internal sensor and external probe)
Measuring range

700 to 1100 hPa


±3 hPa


0.1 hPa

General technical data

510 g (instrument)


210 x 95 x 39 mm ((LxWxH))

Operating temperature

-5 to +45 °C

Product-/housing material


Protection class


Connectable probes

4 x digital Bluetooth® probe or testo Smart Probe; 2 x digital probe with fixed cable or temperature probe NTC with fixed cable (via Testo Universal Connector – TUC); 2 x temperature probe TC type K with fixed cable

Product colour


Camera image size

Main camera: 8.0 MP; Front camera: 5.0 MP

Battery life

approx. 10 hrs continuous operation

Display type

5.0″ touch display, HD 1280*720 pixels, IPS (160 k)

Power supply

Rechargeable li-ion battery (5550 mAh)


Bluetooth®; USB; WLAN


2 GB; 1,000,000 measuring values

Storage temperature

-20 to +60 °C

*TUC connection (Testo Universal Connector): For the connection of fixed cable digital probes and NTC probes.



Instruction Manual


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Universal IAQ Instrument (testo 400)
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