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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.

Professional, standard-compliant, and convenient determination of the volume flow

With the testo 400 universal IAQ instrument.

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

The universal air velocity & IAQ measuring instrument testo 400

One measuring instrument for all climate-related parameters


testo 420

testo 420 volume flow hood

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.

Practical guide

Air flow measurements in ducts according to DIN EN 12599

Download the exclusive practical guide for free now.

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Significance of air velocity

Measurement of the right air velocity

The right measurement location

The measurement method

Analysis of the measurement values

The measurement report

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testo Smart App

One App for all applications.

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

Now new:

PRO measuring programs for increasing the efficiency of your applications

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Compatible with all Bluetooth-enabled Testo measuring instruments


Direct report dispatch by e-mail


All measurement values at a glance


Intuitive measurement menus


Free download, free use


PRO measuring programs