... Weight: 180gVA8021 Temperature/Humidity/Vane anemometer Measure: m/s, km/h, fpm, mph, kts, Beaufort, %RH, td(dew point temperature), °C, °F ... Resolution: 0.1 m/s, 1 fpm, 0.1%RH, 0.1°C, 0.1°F Range: 0 ... .4~20 m/s, 80~4000 fpm, 0~100%RH, -10~50°C, 14~122°F Accuracy ... reading + 0.3m/s)±(2% of reading + 60fpm)±3%RH (5~95%RH)±1°C, ±1.8°F Special function: Auto power ...