Environmental Meter Environmental Sensor Type Relative Humidity Sensor Air Velocity Range 0.4 to 20 m/s 0.8 to 38.8 knots 0.9 to 44.7 mph 1.4 to 72 km/h 80 to 3937 ft/min Series Extech Environmental Meter Dew Point Range -25.3 Degrees to 49.0 Degrees C Meter Type Environmental Meter Surface Temperature Range -100 Degrees to 1300 Degrees C -148 Degrees to 2372 Degrees F Humidity Range 10 Percent to 95 Percent Air Velocity Accuracy +/-3 Percent Battery Type (3) AAA