1,Compact Design 2,Display Air Velocity and Temperature and Windchill 3,Wind Speed Unit ... Selectable 4,Beaufort scale displa Measurement itemsAir velocity&Air temperature Measurement rangeAir velocity:0~45m/s, 0 ... ~140km/hr, 0~8800Ft/min, 0~88Knots, 0~100mph (Accuracy:± 3%)Air temperature: 0~45°C,32~113°F( Accuracy:±2°C)Resolution0.2°C, 0 ...