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Specification: Wind speed range Unit Range Resolution Threshold Accuracy M/s 0 ~ 30 0.1 0.1 +/-5% Ft/min 0 ~ 5860 19 39 +/-5% Knots 0 ~ 55 0.2 0.1 +/-5% Km/hr 0 ~ 55 0.2 0.3 +/-5% Mph 0 ~ 65 0.2 0.2 +/-5% Temperature and Humidity range Unit Range Resolution Accuracy °C -10 ~ 50 0.1 +/-1 °F 14 ~ 122 0.1 +/-2 %RH 20 ~ 90% 1 +/-5% Battery CR2032 2.0V Operating temperature -10 ~ 50°C (14 ~ 122°F) Operating humidity Less or equal 90% Current consumption About 2.5mA weight 60g Caution: This meter is accurate at low and mid-range air speeds. Consistent use at very high speeds, i.e. from the window of a fast moving car will damage the impeller’s bearing and reduce accuracy. This meter is not a personal safety device.