WM-300 WindMate w/Wind Direction & HumidityThe WM-300 is a comprehensive instrument for agriculture, forestry, emergency management and other industry professionals. In addition to relative humidity, the unit measures dew point, wet bulb, Delta T, temperature & wind chill. It has a USA-made fluxgate compass for precise digital wind direction measurement, and it can also be used to calculate crosswind, head/tail wind readings. Unlike a traditional compass, the WM-300 reads when held vertically and can be used to take a bearing on a distant landmark or reference location. The WM-300 includes the Accuweather patented Comfort Index, which is the effect of temperature, wind speed, relative humidity and sun intensity on the human body for a superior human based reference to Heat Index. WM-300 can be tripod-mounted and accommodates the Model SM-WT wind tunnel accessory for very precise measurements. All WindMates are designed with a wind speed accuracy of better than +/- 3% and have a 2-Year warranty.Features:Wind SpeedWind DirectionTemperatureRelative HumidityWind ChillWet BulbDew PointDelta TComfort Index (Accuweather.com patented)Digital CompassDisplays current, maximum and average wind speedReports wind direction in both degrees and compass pointsCalculates head, tail and cross windWater resistant and floats