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

Results!   That easily.

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!

Features

• 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