Testo 400 | Multi-function IAQ meter

Contact Instrument Solutions

The Testo 400 is a multi-function instrument for all IAQ professionals, enabling you to measure, document and analyse all IAQ parameters with just one instrument. Available as an instrument only where you can add on a range of different probes and accessories, or in a number of pre-configured kits that includes one specially designed for thermal comfort.  There are many features to this product range including:-

Intuitive measurement menus

The Testo 400 actively assists you in taking standard-compliant measurements. It guides you step by step through the comfort level measurement and assists you in evaluating the measurement results.

Wireless convenience

Numerous probes for comfort level and indoor air quality are also available in the wireless Bluetooth variant. This means less stress for you and more space in the measuring case. 

IAQ long-term measurements

The IAQ data logger can be used independently for long-term measurements with up to six different probes after it has been programmed using Testo 400 handset.

Practical accessories

Use the measuring tripod for comfort level measurements to position the compatible measuring instrument and the probes in compliance with the standards at all times.

Testo 400 IAQ and comfort kit which comes complete with measuring tripod and x4 probe mounts
Testo 400 in-use in an office environment with a CO2, temperature and humidity probe

Smart, intuitive, practical: Measurement programs, measurement data management and operation

For error-free measurements in accordance with various standards: Smart, intuitive measurement menus and evaluation of readings 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 along with full documentation including photos, comments and your own Company logo at the customer’s premises, and send by e-mail (via WLAN).

Customer and measuring point management is carried out on the measuring instrument itself – for efficient work on site.

Smart-touch display for intuitive operation of the IAQ measuring instrument.

Testo DataControl 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.

Technical data

Please refer to the data sheets and manual for the full instrument and probe specifications.

Overview of the Testo 400 multi-functional instrument

Support documents

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Testo 400 and IAQ data logger user manual.pdf Testo 400 and IAQ data logger user manual
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Technical document
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Testo 400 data sheet.pdf Testo 400 data sheet
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Technical document
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Testo IAQ data sheet.pdf Testo IAQ data sheet
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Technical document
File type
Adobe Acrobat
Download (2 MB)

Common customer questions & answers

QQuestion How long Testo 400 is the battery life?
AAnswer Battery life depends on the probe (s) fitted and if the display is off. Typical battery life is 8 hours if fully charged before use.