WM40 WeatherMeter
Pocket-size weather station features complete windspeed functions and includes a severe weather alarm, if the barometric pressure falls or rises 6 millibars over a three-hour period; Highly accurate hygrometer; Current, maximum windspeed, average windspeed over 5 seconds; Replaceable plastic impeller won't corrode; Comes with lanyard; Threaded for tripod mount; Floats

• Accuracy: Windspeed +/- 3%
  Temperature/Windchill +/- 2 F
  Relative Humidity +/- 3%
  Dewpoint +/- 3 F
  Heat Index +/- 4 F
• Barometric Pressure +/- 3 hPa (millibars)
• Range: Wind: .4-89 MPH

Temp 5 -- 122 F
Windchill: -22 -- 158 F
Heat Index: 69.8 -- 155.8 F
Humidity: 0 - 99%
Barometer: 400 - 1100 hPa
Altitude: -650 - 9000 meters
• Optional Units: Windspeed: Knots, MPH, KPH, M/Sec, Ft/Min, Beaufort
  Temperature: Fahrenheit, Centigrade
• Barometer: Inhg or hPa (millibars)
• Operating Modes: Current windspeed - average over 2 seconds
  Average windspeed - 5 seconds
  Maximum windspeed - 2 second gust since power on
  Temperature/Windchill/Humidity/Dew Point: 1min.
  Barometer: 15 min sampling updated each minute
• Power: 400-Hr Lithium battery/CR2032 (included)
• Measures: 5.875" x 2.1" x .85" (closed)
• Weighs: 4 oz