Measurements in Laboratories and Cleanrooms

For measurement applications in laboratories and other controlled environments, suitable testo 440 probes enable critical process control measurements, for which maximum precision and resilient equipment are essential. The testo 440 and its probes are ideal for industrial environments where temperatures are high, as well as laboratories, where it is essential to record even the smallest values with a high level of accuracy.

  • Intuitive measurement menus
    The testo 440 comes programmed with clearly structured measurement menus for a variety of applications.
  • Convenient measurement
    Do you carry out measurements in environments where Bluetooth connections are not possible? 
    No problem – simply insert the probe head onto a cable handle instead, and you’re done.
  • High-precision probes
    Fume hood probes for laboratories and cleanrooms, vane probes for laminar flow measurement, and humidity probes with an error of <1%.
  • Low maintenance instrument
    Only the individual probe heads need to be calibrated. You can use the measuring instrument and handle with a variety of interchangeable probes.

The specially designed, high-precision probes for the testo 440 air velocity & IAQ measuring instrument can assist you in a variety of applications, such as:

  • Reliable measurement of laminar flow
  • Accurate recording of even the smallest differences in air velocity, from 0.02 m/s
  • Measuring humidity in critical processes with a high level of accuracy

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Use these probes with the testo 440 to measure with precision:

Vane Probe

testo 440 high-precision vane probe

  • 4" Ø vane probe, wired or with Bluetooth, including temperature sensor
  • Low startup speed (0.1 m/s)
  • Measures air velocity and temperature
  • Ideal for laminar flow measurements

Humidity/Temperature Probe

testo 440 high-precision humidity/temperature probe

  • Humidity measurement for critical processes
  • Fast response time
  • Accuracy of ±0.6% RH + 0.7% of m.v. (0-90% RH)

Hot Wire Probe

testo 440 hot wire probe

  • Measurement range of up to 50 m/s with automatic absolute pressure compensation
  • Includes temperature and humidity sensor
  • Wireless and wired connectivity options for the testo 440


Fume Hood Probe

testo 440 fume cupboard probe

  • Wired connection to the testo 440
  • Measures air velocity and volume flow in laboratory fume hoods
  • Complies with DIN EN 14175-3/4
  • Exceeds ASHRAE 110 by measuring velocities as low as 5 fpm

Use this information to measure more effectively:

Intuitive Measurement Menus

The menus programmed in the instrument efficiently guide you through volume flow measurements in ducts and at outlets, and with K factor and pitot tube measurements.

testo 440 Probes

Which probe for which application? Download this probe comparison and learn all about the testo 440 portfolio of probes.

Comprehensive Brochure

A wealth of information relating to the testo 440:

  • All probes and accessories
  • Special kits for any application
  • Details on instrument navigation

testo 440 dP

For pitot tube measurements and checking filters on air conditioning systems, we recommend the testo 440 dP, which includes a differential pressure sensor.