16mm reel probe for Testo 440

Characteristics:

This probe is suitable for measuring average flows from 0.6 m / s. Must be attached to a Testo meter to read via cable. It incorporates an extendable telescopic arm that allows you to delve into the ventilation duct reaching great depth.
Its specifications are as follows:
-Head diameter: 16 millimeters.
-Maximum length of the telescopic arm: 890 millimeters.
-Operating temperature: 0 to +60 ºC.
-Measured speed range: +0.6 to +40 m / s.
-Margin of error: ± (0.2 m / s + 1.5% of vm)