Testo 425 - Compact Thermal Anemometer

With fixed velocity probe incl. temperature measurement and telescope (max. 820 mm), battery and calibration protocol
Part number: 0560 4251
Manufacturer: Testo
£349.00 (ex VAT)

The compact testo 425 anemometer with permanently attached thermal flow probe (probe head Ø 7.5 mm) incl. telescopic handle. Volume flow is shown directly in the display. Accurate volume flow calculation thanks to easy input of duct area. In addition, it is also possible to switch to the current temperature reading. Timed and multi-point mean calculation provide information on mean volume flow, flow speed and temperature reading. Min/max values can also be shown in the display. The Hold function makes it possible to freeze current readings in the display.

  • Temperature, flow and volume flow measurement
  • Multi-point and timed mean calculation
  • Max/min values
  • Hold button to freeze readings
  • Display light
  • Auto Off function
  • TopSafe, the indestructible protective case (optional)

Storage temperature

-40 to +85 °C

Operating temperature

-20 to +50 °C

Battery type

9V block battery, 6F22

Battery life

20 h


285 g


182 x 64 x 40 mm



Probe - NTC

Meas. range

-20 to +70 °C


±0.5 °C (0 to +60 °C)

±0.7 °C (remaining range)


0.1 °C

Probe - Thermo

Meas. Range

0 to +20 m/s


±(0.03 m/s +5% of mv)


0.01 m/s

Customers who bought this item also bought

Testo 175 T3 - 2-channel Data Logger

With external sensor connections (TC Type T and Type K) incl. wall holder, lock, batteries and calibration protocol
£155.00 (ex VAT)

TopSafe, waterproof protection case

Protects measuring instrument from water, dust and impact, Dishwasher safe.
£20.90 (ex VAT)

Testo 510 - Differential Pressure Meter (with hoses)

incl. testo 510, protection cap, belt holder, 2 x connection hoses, wrist strap, calibration protocol
£109.00 (ex VAT)