SM-19 Skymate Plus with Humidity, Dew Point, & TempSkymate Plus has all the wind features of the SM-18 plus an accurate hygrometer for relative humidity and dew point. The Honeywell humidity sensor is easily recalibrated. The SkyMate Plus is a competitively priced instrument designed for agriculture and forestry professionals and was recently approved by MSHA for use in Underground Mining applications. For the most precise measurements, it can be used with the optional wind tunnel, Model SM-WT; or tripod mounted using the optional tripod mounting fixture. SM-19 wind meters are designed with a wind speed accuracy of better than +/- 3% and have a 2-Year warranty.Features:Wind SpeedTemperatureRelative HumidityWind ChillDew PointDisplays current, maximum and average wind speedWater resistant and floatsMSHA Approved