The Speedtech Instruments SM-19 SkyMate Plus Handheld Wind Meter with Temperature & Humidity has all the wind and temperature features of the Speedtech SM-18 plus an accurate hygrometer for relative humidity and dew point. The Honeywell humidity sensor can be easily recalibrated. The SkyMate Plus is a competitively priced instrument designed for agriculture and forestry professionals. SkyMate Plus is water resistant, floats, has a high-visibility case and tripod fitting. For the most precise measurements, it can be used with Speedtech's wind tunnel (model SM-WT).