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    Climate measurement improved to the maximum.

    testo 400 in laboratories and cleanrooms.

    The universal air velocity & IAQ measuring instrument testo 400

    We recommend: Universal air velocity & IAQ (Indoor Air Quality) measuring instrument testo 400

    For high-precision measurements of all climate-related parameters in cleanrooms and laboratories

    • Intuitive measurement menus: Clearly structured measurement menus are stored in the measuring device and guide you safely and efficiently through the respective application.

    • Convenient measurement: Do you measure in environments where Bluetooth is not possible? No problem: simply insert the probe head from the Bluetooth handle onto the cable handle and you’re done.

    • High-precision probes: Fume cupboard probes for laboratories/cleanrooms; vane probes for laminar flow measurement; humidity probes with an accuracy of

    • Intelligent calibration concept: Only the probe heads need to be calibrated. You can carry on working with the measuring instrument, handle and another probe.

    Precise measurement technology for laboratories and cleanrooms

    High degree of precision is required

    The specially developed, high-precision probes support you in these applications, among others:

    • Highly accurate and position-independent differential pressure measurement (only with testo 400)

    • Reliable measurement of laminar flows

      Accurate recording of even the smallest differences in flow

    • Accurate recording of even the smallest differences in air velocity, from 0.02 m/s

    • Measuring humidity in critical processes with an accuracy of 1 %

    Differential pressure

    High degree of precision is required

    The specially developed, high-precision probes support you in these applications, among others:

    • Highly accurate and position-independent differential pressure measurement (only with testo 400)

    • Reliable measurement of laminar flows (laminar flow)

    • Accurate recording of even the smallest differences in air velocity, from 0.02 m/s

    • Measuring humidity in critical processes with an accuracy of 1 %

    Measurement of laminar flows with testo 400

    High degree of precision is required

    The specially developed, high-precision probes support you in these applications, among others:

    • Highly accurate and position-independent differential pressure measurement (only with testo 400)

    • Reliable measurement of laminar flows

      Accurate recording of even the smallest differences in flow

    • Precisely detect the smallest flow differences from 0.02 m/s

    • Measuring humidity in critical processes with an accuracy of 1 %

    Detect the smallest flow differences with testo 400

    High degree of precision is required

    The specially developed, high-precision probes support you in these applications, among others:

    • Highly accurate and position-independent differential pressure measurement (only with testo 400)

    • Reliable measurement of laminar flows

      Accurately recording even the smallest differences in flow

    • Accurately recording even the smallest differences in air velocity, from 0.02 m/s

    • Measure humidity in critical processes with an accuracy of 1 %

    Measure humidity with testo 400

    Probes for measurements in clean rooms and laboratories

    • Digital Pt100 temperature probes

    • Digital probes for humidity and temperature

    • Digital probes for flow measurements

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    Precision measurement technology and services for cleanrooms. From Testo.

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    Brochure Measurement technology for cleanrooms

    Product configurator

    Product consultant

    Customised multifunction instrument

    • Put your own combination together:

    • Measuring instrument, probes and accessories

    • tailored to your application

    Multifunction measuring instrument testo 440

    More details

    The alternative: testo 440 compact

    • Clear display

    • Easy button operation

    • Measurement data storage in the instrument

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    Air velocity & IAQ (Indoor Air Quality) measuring instruments

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    Everything else you need to know about the testo 400 and other measuring instruments for laboratories and cleanrooms

    Product brochure testo 400

    testo 400 brochure

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    Overview of the testo 400 measurement menus

    Overview of the measurement menus

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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.

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    testo Smart App

    Multifunctional

    Compatible with all Bluetooth-enabled Testo measuring instruments

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    Direct report dispatch by e-mail

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    All measurement values at a glance

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    Intuitive measurement menus

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