LTC Handheld Digital Anemometer GM816 Air Wind Speed Scale Gauge Meter Air Flow Velocity Thermometer with LCD for Windsurfing Sailing Fishing Air Velocity & Temperature Measurement. Max/Average/Current air velocity measurement. Five units of air velocity: M/s, Km/h, ft/min, Knots, mph. / Temperature unit selection Beaufort scale. Backlight display. Wind chill indication. Manual/Auto power shut off. Low battery indication.