Heating technology

Ambient CO measurement

Ambient CO measurement on heating systems

Invisible and toxic: When organic materials such as oil, gas or solid fuels combust incompletely, carbon monoxide (CO) occurs. CO in indoor air can be lethal, as it is colourless, odourless and tasteless. That is why it is necessary to carry out an ambient CO measurement during the installation and servicing of heating systems. Above all, testing must be carried out:

  • At locations which are often frequented by people

  • At combustion locations of heating systems

  • In the surroundings of gas and oil boilers

With CO measuring instruments from Testo, you are on the safe side in seconds. You prevent accidents and guarantee the correct operation of the heating system.

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Ambient CO measuring instruments

testo Smart App

Welcome to the testo Smart World: The whole world in one App.

Faster, easier, smarter: The testo Smart App brings all tools and measurements together - and documentation can also be dealt with conveniently using a smartphone or tablet. Benefit from intelligent connectivity and the unique all-in-one solution for all applications. So that not only the jobs on all heating systems are carried out smartly and effortlessly.

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Parallel measurement

Efficient and safe


Uncomplicated and safe

Customer data management

Quick and easy

Data transfer

Professional and comfortable

Second Screen

Simply comfortable

Remote Control

Simple and flexible

Other applications

Flue gas analysis

Exhaust and flue gas measurement on heating systems and other small combustion plants is used to determine the level of pollutants emitted and the heat energy lost.

  • The atmosphere should be contaminated by pollutants as little as possible.

  • Energy should be used as efficiently as possible.

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Customer Service

If you experience any malfunctions, please send in your measuring instrument with a brief description of the fault. Please also give us your telephone number for any inquiries. Normally, you’ll get your measuring instrument back within one week.


Our subsidiary company Testo Industrial Services supports you daily in ensuring quality while always adhering to the relevant norms and guidelines. You get all the services you need from one provider.

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