Measures Air Velocity, Air Flow and Temperature - Temperature Range: 14-140-Degree F - Weight: 1.6-Pound Including Battery and amp; Probe * Air Velocity Units: M/sec, Km/H, Ft/Min, MPH, Knots - Display: Dual Function 4-Digit LCD - Sensor Head: 2.75"" Diameter * Air Velocity Accuracy: +/- 3-Percent - Sampling Rate: 1 Reading Per Second - Auto Power Off After 20 Minutes * Sensors: Conventional Angled Vane Arms with Low-Friction Ball Bearing, NTC-Type Thermistor - Main Instrument Dimensions: 7.0"" x 2.9"" x 1.2"" * Temperature Units: -DegreeC/-DegreeF - Battery: 9V Battery- Air Flow Units: CMM (Cubic Meters/Min), CFM (Cubic-Feet/Min) -