Geartist (TM) Digital LCD Anemometer Thermometer Air Wind Speed Scale Gauge Meter Backlight (GT816) Wind speed range: 0.3 to 30 m/s Accuracy: +/- 5% Temperature range: -10 to 45 C Accuracy: +/-2 C (C/F selection) Max wind speed measuring, Average, current wind speed measuring Resolution: 0.1 m/s ; 0.2 C, Measuring unit: m/s, Ft/min, Knots, Km/hr, Mph Auto power off, Low battery indication