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Features: Simultaneous display of Air Flow or Air Velocity plus Ambient Temperature. Easy to set Area dimensions (cm²) are stored in the meter's internal memory for the next power on. Resolution of 0.01m/sec. 20 point average for Air Flow. Super large LCD backlight Display. High sensitive and accurate. Specifications: Air Velocity: M/S Range: 0.40 to 30.00m/s; Resolution: 0.01m/s; Accuracy: ±(3% + 0.20 m/s). Km/H Range: 1.4 to 108.0km/h; Resolution: 0.1km/h; Accuracy: ±(3% + 0.8 km/h). Ft/Min Range: 80 to 5900ft/min; Resolution: 1 ft/min; Accuracy: ±(3% + 40 ft/min). MPH Range: 0.9 to 67.0mph; Resolution: 0.1mph; Accuracy: ±(3% + 0.4 MPH). Knots Range: 0.8 to 58.0knots; Resolution: 0.1knots; Accuracy: ±(3% + 0.4 knots). Air Flow: CMM (cubic meters/min) Range: 0 to 9999m3/min; Resolution: 1; Area: 0-9.999m². CFM (cubic ft/min) Range: 0 to 9999ft3/min; Resolution: 1; Area: 0 to 9.999ft². Air Temperature: Range: 14 to 140°F/-10 to 60℃; Resolution: 0.1°F/℃; Accuracy: 4.0°F/2.0℃. Display: Dual function 0.5" (13 mm) 4-digit LCD. Sampling Rate: 1 reading per second approx. Sensors: Air velocity/flow sensor: Conventional angled vane arms with low-friction ball bearing. Temperature sensor: NTC-type precision thermistor. Automatic Power Off: Auto shut off after 20 minutes to preserve battery life. Operating Temperature: 32 to 122°F/0 - 50°C. Storage Temperature: 14 - 140°F/-10 - 60°C. Operating Humidity: < 80%RH. Storage Humidity: < 80%RH. Operating Altitude: 2000 meters (7000ft) maximum. Power suppy: 9V/6F22 Battery (Not Included). Dimensions: 200 x 85 x 40mm (only Host computer). Weight: 240g (only Host computer). Package Included: 1 x NKTECH NK-W3S Digital Anemometer. 1 x Anemometer Probe Head. 1 x English User's Manual. 1 x TL-1 Screwdriver. 1 x Carrying Bag.