Kestrel 4100


Kestrel Specifications

CFM made easy!

1. Select shape of duct....
2. Set dimensions....
3. Hold meter in air flow....

Results! That easily.

No equations or calculators required!

Finally, a hand held unit that measures everything you need to know on a job site. The Kestrel® 4100 is the new revolution in HVAC monitoring.

Winner of the ACHR News Dealer Design Awards for excellence in product design!


  • Air flow in cfm, L/s, m³/s, m³/m, m³/h
  • Air Velocity in ft/m, mph, m/s, km/h, kts, Beaufort
  • Temperature in °F or °C
  • Humidity in %
  • Additional measurements of dewpoint, wind chill and heat stress index
  • Data Logger (automatic and manual)
  • Minimum, Maximum and Average values
  • Multi-Function 3-line display
  • Impeller can be replaced without tools
  • Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
  • Graphical Display for logged values
  • Upload to a computer (with optional interface)
  • Backlight for low light conditions
  • Includes neck and wrist lanyards, protective pouch and 2 AAA batteries
  • 2-year warranty
  • Assembled in the USA
  • US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074

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