Hot Wire Probe - Hot Wire Probe

Order-Nr.  0635 1025

  • Very small probe head diameter (7.5 mm) – ideal for measurements in inaccessible places

  • Integrated temperature measurement up to +70 °C

  • With telescope (can be extended to 820 mm)

  • Flow measuring range: 0 to +20 m/s

Product no longer available. Have you checked out its successor?
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Please note that the successor product is only compatible with testo 400 or testo 440.


Product Description

Use the hot wire probe (thermal anemometer) to determine flow velocity and volume flow in ventilation ducts or at ventilation outlets. It is particularly suitable for low and medium flow velocities up to +20 m/s. The probe can also measure temperatures up to +70 °C at the same time.

The hot wire probe is equipped with a telescope, which can be extended to a maximum length of 820 mm. The probe is also ideal for carrying out measurements in inaccessible places, since it features a very small probe head (Ø 7.5 mm).

Delivery Scope

Hot wire probe (Ø 7.5 mm) with telescope (can be extended to 820 mm) including fixed cable 2.4 m. 

Technical Data

Temperature - NTC

Measuring range

-4.0° to 158.0 °F / -20 to +70 °C


±32.5 °F / ±0.3 °C

Velocity - Hot wire anemometer

Measuring range

0 to 3937 fpm / 0 to 20 m/s


±(5.91 fpm + 5 % of mv) / ±(0.03 m/s + 5 % of mv)

General technical data

Cable length

7.874 ft. / 2.4 m

Length telescope

32.283 in. / 820 mm

Probe head diameter

0.295 in. / 7.5 mm