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CO2, CO, light, sound and rpm

The difference between productivity and inefficiency could lie in an office's indoor air quality (IAQ). Studies have repeatedly shown how temperature, humidity, emissions and even sound affect workers' well-being.

  • Testo's line of IAQ measurement instruments help technicians ensure HVAC systems are working properly. Any inconsistencies may negatively impact the health of staff. Good control of indoor humidity, temperature and all the other variables that comprise IAQ can reduce the chances of personnel having to take sick days and improve their ability to perform daily tasks.

  • The indoor climate is also determined by the prevailing light conditions in the area.

  • Monitoring these light conditions and measuring the lux level are therefore an important part of comfort level measurement in the workplace. Almost everybody has come across this: background noises which easily prevent you from working and from concentrating on something.

  • If the noise level is high at work, staff efficiency is reduced - no matter whether the noise pollution is caused by equipment or colleagues. In addition to rpm measurement of rotating objects, the speed or length of conveyor belts and goods sold by the metre can also be measured using contact measurement via a measuring wheel. There is also the possibility of determining the rpm of rotating objects without contact using a reflection mark and a light beam emitted by the instrument.

Multifunction measuring instruments: online product configurator

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Measurement of indoor air quality and comfort levels

Practical guide

Indoor air quality and comfort level in the workplace

Download the exclusive practical guide for free now.

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What does indoor air quality mean?

Monitoring indoor air quality in practice

What is thermal comfort level?

Reasons for using measuring technology

Actions taken by a measuring technology technician in the event of a complaint

And much more ...

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Testo offers lux measuring instruments which can be used to measure the luminous intensity of natural or artificial light.


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Our portable sound level meters are ideally suited for volume measurement.


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

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Direct report dispatch by e-mail


All measurement values at a glance


Intuitive measurement menus


Free download, free use


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