Versatility in a compact design

Welcome to a new era: the new 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.

Would you welcome some advice?

In the online configurator, you can easily put together your own personal combination of measuring instrument, probes and accessories.
  • 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 cost-effective
    Save money when using the testo 440: the measuring instrument does not need to be calibrated, it measures all air velocity & IAQ parameters and the probes can be flexibly extended.

The measuring instrument for any air conditioning application

Air velocity 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:

1. Intuitive: clearly structured menus, large display

testo 440 intuitive measurement menus

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.

2. Wireless: probes with Bluetooth

testo 440 wireless probes

No cables – no problems!

The Bluetooth probes for the testo 440 are available for all applications. They transfer readings to the measuring instrument wirelessly.

This guarantees greater efficiency and less cable clutter in the measuring case.

3. Saves space: 1 handle for all probes

testo 440 handle
The testo 440 Bluetooth or cable handle can be universally combined with all the attachments in the testo 440 probe system. So you need less equipment, and it will take you a matter of seconds to switch from measuring the comfort level to determining the volume flow in ducts.

4. Economic: a one-off investment that will benefit you for a long time

Save money over the long term with the testo 440

The testo 440 air velocity & IAQ measuring instrument is an investment in smart, robust technology, which will certainly pay off for you:

  • Suitable for all air-conditioning applications – you don’t need any other measuring instruments
  • Probes can be flexibly extended – lower costs for accessories/probes
  • testo 440 and testo 440 dP do not need to be calibrated – no downtimes

What do you need to measure?

Use these downloads to measure more effectively

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.

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

Tips & tricks for carrying out air flow measurements in ducts

For example, find out more about:

  • The most important probes for every application
  • Carrying out acceptance test measurements correctly in accordance with DIN EN 12599
  • Identifying and preventing measurement errors

Would you welcome some advice?

Do you have any questions?
We're happy to help you.


Air velocity 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