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Compact Thermal Anemometer
Model Testo 425

FEATURES

The compact testo 425 anemometer with permanently attached thermal flow probe and
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 als 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.

COMPACT THERMAL ANEMOMETER

•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

Accessories Part no.
Case for measuring instrument and probes 0516 0210
TopSafe, protects from impact and dirt 0516 0221
Recharger for 9V rechargeable battery 0554 0025
For external recharging of 0515 0025 battery 0554 0025
9V rech. battery for instrument 0515 0025
testo 425, thermal anemometer with permanently attached flow probe, incl. temperature measurement and telescopic handle (max. 820 mm), battery and calibration protocol Part no.
0560 4251

SPECIFICATIONS
Probe Type NTC Thermal
Meas. range: -20 to +70 °C 0 to +20 m/s
Accuracy ±1 digit: ±0.5 °C (0 to +60 °C) ±(0.03 m/s +5% of mv)
Resolution: ±0.7 °C (remaining range) 0.01 m/s
Oper. temp.:  -20 to +50 °C -20 to +50 °C
Storage temp.: -40 to +85 °C -40 to +85 °C
Battery type:  9V block battery, 6F22 9V block battery, 6F22
Battery life:  20 h 20 h
Dimensions: 182 x 64 x 40 mm 182 x 64 x 40 mm
Weight: 285 g 285 g
Material/Housing ABS ABS
Warranty: 2 years 2 years