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Intuitive climate measurement

The testo 440 combines versatility with maximum ease of use.

Versatility in a compact design

Welcome to a new era: the testo 440 combines a compact hand-held measuring instrument with intuitive measurement menus and a comprehensive selection of air velocity & IAQ probes. Use it to keep all your air conditioning and ventilation measurements safely and reliably under control.

  • Intuitive measurement menus
    Clearly structured menus for volume flow, K factor, degree of turbulence, heating/cooling output, mould detection and long-term measurement are programmed into the instrument.

  • Wireless convenience
    All the testo 440 probes are also available as wireless Bluetooth versions. This makes for less cable clutter in the measuring case.

  • Clear display
    Measurement configuration and display of readings and measurement results at a glance.

  • Particularly economical
    The testo 440 saves you money:
    the measuring instrument does not need to be calibrated, it measures all air velocity & IAQ parameters and the probes can be flexibly extended.

Multifunction measuring instruments: online product configurator

to the consultant

Kje bi radi uporabljali svoj vakuumski merilnik?

The measuring instrument for any air conditioning application

Flow measurement in ducts and at outlets

  • Intuitive menus: clearly structured for volume flow-, K factor and Pitot tube measurements

  • Convenient measurement: Bluetooth probes and extendable telescopes

  • With a differential pressure sensor: the testo 440 dP for Pitot tube and filter measurements

Measuring comfort level and indoor air quality

  • Intuitive menus: turbulence measurement in accordance with ISO EN 7730/ASHRAE 55

  • Integrated long-term measurement: monitor setpoints at freely selectable measuring intervals

  • A comprehensive selection of probes: turbulence, CO2, temperature, humidity, CO, lux

Measurements in laboratories and cleanrooms

  • Intuitive menus: clearly structured for volume flow measurement

  • Special applications: high-precision probes with an unrivalled level of accuracy

  • Convenient measurement: Bluetooth or cable, the right probe for any measuring location

4 reasons why the testo 440 will make your work even more efficient

Clearly structured menus, large display

Menus for measuring volume flow, K factor and degree of turbulence in accordance with EN ISO 7730/ASHRAE 55, heating/cooling output, mould detection and long-term measurement are programmed into the instrument and automatically guarantee reliable measurement results.

Measurements can easily be configured via the large display; see readings/results at a glance.

What do you need to measure?

Kje bi radi uporabljali svoj vakuumski merilnik?

Raven udobja:

Izvedite več.

In laboratories/cleanrooms

Izvedite več.

Use these downloads to measure more effectively

Kje bi radi uporabljali svoj vakuumski merilnik?

Measurement menus


The intuitive measurement menus

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

Probe comparison


All probes for the testo 440

Which probe for which application? Download probe comparison now and find out all about the testo 440 portfolio of probes.



The comprehensive testo 440 brochure

A wealth of product knowledge relating to the testo 440:

  • All probes and accessories

  • Special kits for any application

  • Details on the intuitive measurement menus