Indoor air quality and comfort level

Measurements of indoor air quality

The carbon dioxide concentration and the indoor air quality in interiors are deemed to be the most important indicators that the quality of the indoor air is good enough.

  • Evaluate indoor air quality through CO2- and other measurements

  • CO2 concentration should not exceed 1000 ppm

Testo offers you numerous measuring devices, which are particularly suitable for measuring these parameters.

Measuring instruments for indoor air quality and CO2


Indoor air quality and comfort level

Regular measurements of indoor air quality and comfort at workplaces allow for precise adjustment of the room climate.

Testo measuring devices help you ensure a comfortable climate in all rooms.

Practical guide

Indoor air quality and Comfort at work

Download the exclusive practical guide for free now.

Go to download

What does indoor air quality mean?

Monitoring indoor air quality in practice

What is thermal comfort?

Reasons for using measurement technology

Remedial procedures in the event of a complaint

And much more...

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testo Smart App

One app for all measurements

The testo Smart app guides you quickly and easily through measurements on refrigeration, air conditioning and heating systems.

New Features:

PRO measuring programs to increase the efficiency of your applications

>> Adjustments to the ventilation system

>> Multi-measuring point measurement

More Info


Compatible with all Bluetooth-enabled Testo measuring devices.


Reports can be sent directly via email.


All measured values at a glance.


Intuitive menus


Free to download, free to use (Base App)


PRO Measurement Programs (subscription required)

Our services


Do you have any questions or would you like a personal consultation?
We would be more than happy to help you.

Customer services

In case of malfunctions, send in your meter with a short description of the error. Please also include your telephone number for any queries. Normally you will receive your meter back within one week.


Our subsidiary Testo Industrial Services supports you every day in ensuring quality while always complying with the relevant standards and guidelines. You get all the services you need for this from a single source.