The Testo 425 thermal anemometer is a compact, easy to use anemometer with attached thermal probe on a telescopic handle. The Testo 425 thermal anemometer measures air velocity from 0 to 4000 fpm and temperatures from -4 to 160° F. Volume flow can also be measured by simply entering the duct measurements into the Testo 425 thermal anemometer.

The Testo 425 thermal anemometer displays reading on a large, clear display. Switching between flow and temperature readings is easy. The Testo 425 thermal anemometer includes timed and multi-point mean flow calculations which allow for easy flow analysis, volume accumulation estimates, and temperature variation monitoring. Min-Max values are one button simple, while the " Hold " function freezes the current readings in the display for easy data recording.

Specifications
Temperature Range -4 to + 160 ° F ( -20 to 71 ° C) 
Temperature Resolution 0.1° 
Velocity Range 0 to + 4000 fpm ( 0 to 20.3 m/ s) 
Temperature Accuracy ± 0.9 ° F ( 32 to + 140 ° F) 
± 1.3 ° F ( remaining range) 
Operating Temp -4 to + 122 ° F ( 0 to 50 ° C) 
Power Supply 9V battery
Battery Life 20 hr
Velocity Resolution 2 fpm
Velocity Accuracy ± ( 6 fpm + 5% of reading) 
Additional Information anemometer with attached thermal probe on a telescopic handle.

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