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The testo 425 hot wire anemometer can confirm cubic feet per minute (CFM) when conducting duct testing as well as easily switch between flow and temperature readings. The telescoping handle of the thermal probe on this CFM meter makes it easy to reach ductwork above your head.


The testo 425 hot wire anemometer provides incredible accuracy and is easy to use. The telescopic handle of this CFM meter extends to 33 inches, putting even high-up ductwork within reach. For low flow/velocity applications, the testo 425 anemometer is ideally suited and provides accurate, fast and easy readings.
  • Min/Max/Average values make comparisons fast and easy
  • Compact, thermal sensor is ideal for in-duct readings
  • Measure air velocity from 0 to 4000 FPM
  • Bright backlit display provides easy viewing in any environment

What's Included:
  • Testo 425 thermal anemometer with permanently attached flow probe including temperature measurement and telescope (max. 820 mm), calibration protocol and battery.

Key Features:
  • Telescoping hot wire probe
  • Velocity, volume flow (CFM), and temperature
  • Timed and multi-point average flow calculations
  • Auto-off function saves battery life
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Manuals (2)
Product Type:



2 Years

Battery Life:

20 Hours


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