The Extech 45168CP is a Pocket Thermo-Anemometer that measures Windspeed in ft/min, MPH, m/s, km/h, Knots and Beaufort Force with 10 second averaging function. Additional measurements include: Temperature, Relative Humidity, Dew Point, Wet Bulb, and Windchill. The built-in compass provides wind direction/ 360° readings and has an easy-to-use calibration procedure for improved accuracy.