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Testo 405

Category: AIR FLOW

Model: Air Flow

Avaibility: AVAILABLE

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  • Flow velocity measuring instrument with temperature measurement

  • Volume flow measurement up to 99990 m?3;/h

  • Extendable telescope up to 300 mm

  • Display illumination

testo 405 is a thermal anemometer. It allows the precise measurement of air flow velocity, volume flow and temperature. With the extendable telescope (up to 300 mm), testo 405 is particularly suited for measuring the  flow velocity in ducts. Thanks to the  attachment included in delivery, the telescope can be optimally positioned in a duct. 

The testo 405 measures especially accurately in the range from 0 and 2 m/s. Low air flow velocities such as   at draughty windows, for example, can thus be localized exactly and measured extremely accurately. The display can be rotated into different positions. This enables optimum readout of the measurement values.


Technical data / Accessories

General technical data

Storage temperature

-20 to +70 °C

Operating temperature

0 to +50 °C

Battery type

3 AAA micro batteries

Battery life

Approx. 20 h


490 x 37 x 36 mm

Length Probe shaft

300 mm

Diameter Probe shaft /

Ø 16 mm /

Probe shaft tip

Ø 12 mm


115 g (with batteries, without packaging)

Sensor types




Measuring range

0 to 5 m/s (-20 to 0 °C)

0 to 10 m/s (0 to +50 °C)

0 to +99990 m?3;/h

-20 to +50 °C

Accuracy ±1 digit

±(0.1 m/s + 5% of m.v.) (0 to +2 m/s)

±(0.3 m/s + 5% of m.v.) (remaining range)

±0.5 °C


0.01 m/s

0.1 °C

 Accessories for measuring instrument                                                                                      Part no.

ISO calibration certificate velocity, two point calibration; calibration points 5m/s and 10m/s

0520 0094

ISO calibration certificate velocity, hot wire, vane anemometer, Pitot tube; calibration points 1; 2; 5; 10 m/s

0520 0004



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