Plastimo Windy is a unique handheld anemometers for simple wind speed and temperature measurement. The 3 Cup rotor allows omni-direction, wind speed measurement.FeaturesShows current, average and maximum wind speedAll standard units (knots, m/s, km/h, mph)Beaufort bar graphTemperature in Celsius or Fahrenheit degreeErgonomic shapeNight illuminationAutomatic ON/OFF functionWind speed InformationScale: 1 to 40 m/sUnits: digital knots, m/s, km/h, mphGraphic: Beaufort forceMaximum wind speedAverage speed on 5, 10, 20 or 40 selected secondsAccuracy: 4%Resolution: 0.1 (up to 9.9), 1 (over 10)Air temperature and Windchill InformationScale: -20 to +60 CAccuracy: 1 C (2 F)Units: C or FResolution: 1 C (2 F)Technical SpecificationsMeasurement range: 1,0….40 m/s 0Measurement range temperature: -20….+60 CUnits of measurement: m/s, Km/h, Knots, mph, ft 0Units of measurement temperature: C, FResolution wind speed: 0,1 unit (under 9,9) 1unit (above 10) 0Resolution temperature: 1 C Accuracy wind speed: +/- 4% 0 Accuracy temperature: +/- 1 CAveraging period: selectable 0, 5, 10, 20, 40 secondsBattery: User replaceable 3V lithium battery type CR2032 Battery life: 8.000 hours (up to ten years) sufficient for life time operation at average use Battery life with backlighting: 120 hoursDimensions: Height 135 mm Overall diameter cup to cup: 70mmWeight: 70gram