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Testo 440


Model: Air Flow, Rotation

Avaibility: AVAILABLE

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  • Intuitive: clearly structured measurement menus for the most important applications stored on the instrument

  • Wireless: Bluetooth probes for greater measuring convenience and a reduced tangle of cables in the case

  • Space-saving: a universal handle for all probes

  • Clear overview: parallel display of 3 measuring values; configuration and results at a glance

  • Reliable: internal memory for up to 7500 measurement protocols, USB interface for data export and optional printout of measuring values

The testo 440 combines the benefits  of  a  compact handheld device with intuitive measurement menus and a comprehensive selection of air velocity & IAQ probes. This means you have all measuring tasks on air conditioning and ventilation systems reliably under control. 

You can connect the testo 440 air velocity & IAQ measuring instrument either to a large selection of digital probes, the Testo Smart Probes or numerous Testo temperature probes. Clearly structured menus for measuring volume flow in ducts/at outlets, K-factor, degree of turbulence, cooling/heating load, mould indication and logging mode are stored on the instrument. These menus enable you to accomplish the relevant measuring task more quickly, more efficiently and more reliably. Reports can be exported as Excel files via the USB interface or printed out on site.

The testo 440 air velocity & IAQ measuring instrument is available in two versions. The testo 440 dP model version also has an integrated differential pressure sensor. This makes measurements at filters as well as Pitot tube and K-factor measurements possible.

Technical Data Testo 440


testo 440

testo 440 dP

Temperature (NTC)

Measuring range

-40 to +150 °C

Accuracy (±1 digit)

±0.4 °C (-40 to -25.1  °C)

±0.3 °C (-25 to +74.9  °C)

±0.4 °C (+75 to +99.9 °C)

±0.5% of m.v. (remaining meas. range)


0.1 °C

Temperature (TC)

Measuring range

-200 to +1370 °C

Accuracy (±1 digit)

±(0.3 °C + 0.3% of m.v.)


0.1 °C

Differential pressure


Measuring range




-150 to +150 hPa

Accuracy (±1 digit)

±0.05 hPa

(0 to +1.00 hPa)

±0.2 hPa + 1.5% of m.v.

(+1.01 ... +150 hPa)


0.01 hPa

Probe connections

TC type K


NTC TUC / digital probe with cable


Bluetooth probe

1x digital Bluetooth probe or testo Smart Probe

Differential pressure


Technical data


Operating temperature

-20 to +50 °C

Storage temperature

-20 to +50 °C

Battery type

3 x AA batteries

Battery life

12 h (typically vane measurement)


250 g


154 x 65 x 32 mm



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