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Measurement solutions for air conditioning and ventilation technology

For an optimum indoor climate and better energy efficiency.

Ventilation and air conditioning systems consume a lot of energy. However, they are indispensable for a pleasant room climate. Measuring instruments from Testo help you to control the systems efficiently in order to quickly achieve significant savings and ensure a comfortable climate in all rooms.

Every flow measurement under control - in ducts or at outlets

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Reliable indoor air quality and thermal comfort measurement

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Ventilation and air conditioning systems

Flow measurement with Testo:

convenient, precise, reliable.

For flow measurement in the duct and at the outlet, Testo offers you various measurement solutions - from small Testo Smart Probes to digital anemometers to multifunctional climate measuring instruments.

Discover the suitable measurement solution for your individual requirements.

Determine volume flow in a standard-compliant and convenient way

With the universal air velocity & IAQ measuring instrument testo 400

The testo 400 is a multifunctional air velocity & IAQ measuring instrument that allows you to measure volume flows in ducts and outlets efficiently, intuitively and in compliance with EN ISO 12599 and ASHRAE 11:

  • Intuitive measurement programs, incl. HVAC grid measurement

  • Convenient measurement

  • Efficient data management

  • Intelligent calibration concept

Overview of our product recommendations for you


testo 440

Multifunctional testo 440

Versatility in a compact design


testo 400

Universal measuring instrument testo 400

One measuring instrument for all climate-related parameters

Volume flow hood testo 420

Uniquely light and ideal for measurements at large outlets

Choose your application

Measurements in the ventilation duct

Maintaining the air flows in the ventilation duct is crucial for the function of the ventilation and air conditioning system. If the air flows are lower than planned, the removal of room loads (heating, cooling and material loads) may not be guaranteed under certain circumstances. Therefore, it is particularly important to ensure the most accurate possible measurement of air flows.

Testo offers you numerous measuring instruments that are particularly suitable for measuring in ducts and air conditioning systems.

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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.