Anemometer Kestrel 3500 - impeller air flow meter and more...

  • functions: anemometer, thermometer, hygrometer, barometer
  • measurement:
    • air speed
    • temperature
    • wind chill
    • dew point temperature
    • relative humidity
    • heat stress index
    • wet bulb thermometer temperature
    • altitude
    • density altitude
    • barometric pressure
  • possibility of choosing the result units
  • easy to read LCD display
  • waterproof - IP67
  • battery powered
  • small and resistant device
Anemometr Kestrel 4000


Anemometer Kestrel 3500 is a new generation device for weather monitoring (new implementation from the end of year 2004). This pocket size electronic device is used for measurement of wind speed, temperature, wind chill dew point temperature, wet bulb thermometer temperature (psychrometer), relative humidity, altitude, atmospheric pressure and heat stress index.

The anemometer’s impeller of very light structure, has precise, sapphire bearings, what assures accurate wind measurement also with small air speed. In case of damage the impeller can be easily replaced by a user.

The anemometer has an option of memorising one last  result (function data hold).

Combining of an anemometer and a thermometer allows calculation through a built in device microprocessor an additional parameter–wind chill. The device, apart from a current wind speed, allows on reading maximum wind gust and average in various units.

The anemometer Kestrel 3500 has easy to read LCD display, which is adapted to showing chosen parameters.

The device is powered from a lithium battery (tablet ), which assures continuous work of the device through 400 hours. The device switches off automatically its power supply, if no key button is used for more than 15 minutes.

The anemometer is made out of plastic, and its electronic elements are fully protected from moisture. The device floats, if it is accidentally dropped into water.

The device is equipped with a hard case and a wrist or a neck lanyard (protecting the device from being dropped  during exploitation).


The anemometer is possible to be used in such fields as:

Technical data

Scope of measurement 0,3...40 m/s 
Measurement uncertainty (for a component in a device axis)
+/- 3% of a reading or +/- 0,1 m/s
Underrating indications for wind tilted from a device’s axis   -1% for 5° angle
-2% for 10° angle
-3% for 15° angle
Calibration drift
<2% after 100 hours of work
at 7 m/s speed
Measurement resolution
0,1 kt, m/s, km/h, mph 
1 FPM up to 1999 FPM
10 FPM from 2000 FPM 
1 Beaufort 0...12
Speed measurement result reading   
current average from the last 3 seconds
an average from the moment of switching on the power supply
maximum 3-second wind gusts
from the moment of switching on the power supply
Choice of result units
kt (knots), m/s, km/h, mph (miles per hour), FPM (foot per minute), Beaufort degrees  
Scope of air temperature measurement -29...+70 °C
Measurement uncertainty of air temperature and wind chill +/- 1 °C
Measurement uncertainty of dew point temperature
+/- 2 °C
Measurement uncertainty of heat stress index +/- 3 °C
Measurement resolution 0,1 °C
Temperature measurement result reading
wind chill, heat stress index temperature
Choice of result units
degrees C, F
Measurement uncertainty
typically +/- 5 %, up to +/- 15 %
Scope of measurement 5...95 %
Measurement resolution 0,1 %
Calibration drift
+/- 2 % after 24 months
Response time 1 min.
Measurement uncertainty
+/- 3 hPa in the temperature scope: -10°C...+60°C
Measurement resolution 0,1 hPa in the scope: 870... 1080 hPa
0,01 inch Hg in the scope: 25.7...31.9 cali Hg
Calibration drift
+/- 1 hPa after 12 months
Measurement resolution 1 m in the scope: -500 ... 9000
3 ft (foot) in the scope: -1600...30000
Degree of casing protection
IP67 (waterproof with immersion up to 1 m in depth), floats on the water
Scope of work temperatures
-20...+60 °C
Scope of storage temperatures
-30...+80 °C 
Battery work time
400 hours
Automatic power supply switch off
after 45 minutes
Overall outside measurements
122 x 42 x 20 mm 
Weight 65 g
Impeller diameter
25 mm