The Kestrel 4100 Weather Anemometer is the new revolution in HVAC monitoring.

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
• 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
• Assembled in the USA
  

• Crop dusting & spraying
• Fire fighting
• Mining ventilation
• Ventilation (HVAC)
• Education

Spec Summary:

Air Velocity
Accuracy:	±3%
Response Time:	1 second
Calibration Drift:	<2% after 100 hours use at 7m/s
Knots:	0.6 to 78
Meters per Second:	0.3 to 40
Kilometers per Hour:	1.0 to 144
Miles per Hour:	0.7 to 89
Feet per Minute:	59 to 7877
Beaufort Force:	1 to 16
Air Flow
Accuracy;	±3%
Response Time:	1 second
Calibration Drift:	<2% after 100 hours use at 7m/s
Cubic Feet per Minute:	0 to 99,999
Liters per Second:	0 to 99,999
Cubic Meters per Second:	0 to 99,999
Cubic Meters per Minute:	0 to 99,999
Cubic Meters per Hour:	0 to 99,999
Temperature
Accuracy:
Temperature:	±1°C
Wind Chill:	±1°C
Dew Point:	±2°C
Heat Index:	±3°C
Response Time:	Approximately 1 minute for most conditions
Celsius:	-29 to 70
Fahrenheit:	-20 to 158
Relative Humidity
Accuracy:	±3%
Response Time:	Approximately 1 minute for most conditions
Calibration Drift:	±2% over 24 months (can be field calibrated)
Percent:	5 to 95%
Display
Update:	1 second
Temperature Range:	Normal operation from -4 to 140°F [-20 to 60°C]. Below -4°F [-20°C], accurate readings may be taken by keeping the unit warmer than -4°F [ -20°C] and exposing it for the minimum time necessary to take a reading (less than 1 minute).
Storage Temperature:	-22°F to 140°F [-30°C to 60°C].
Auto Shutdown:	After 15 minutes of no button presses. (This feature can be disabled.)
Physical
Battery:	Two AAA alkaline batteries (included). Typical life, 400 hours
Impeller:	1in. [25 mm.] diameter, sapphire bearings, light weight. User-replaceable impeller/housing assembly
Temperature Sensor:	Hermetically sealed precision thermistor.
Humidity Sensor:	Solid state silicon capacitive sensor
Dimensions:	5" x 1.8" x 1.1" [12.7 x 4.5 x 2.8 cm.]
Weight:	3.6 oz. [102 g.]

*Specifications are subject to change.