For measuring air velocity, volume flow and temperature in ventilation ducts.

Accurate measurements from 0 to 30 m/s and -20 to +70 °C thanks to the robust sensor and automatic absolute pressure compensation

The set includes: testo 440 air velocity and IAQ measuring instrument, 3 x AA batteries, USB cable, hot wire probe (Ø 9 mm) with fixed cable (length 1.7 m) including temperature sensor, with telescope (can be extended to 0.85 m) , basic case for testo 440 and 1 probe