Features 5 units of air speed converter: m/s, ft / m, mph, km/h, knots. Conversion of 2 air temperature units: /. Measured by 6-leaf wind wheel with low friction bearing design, the meter has high sensitivity and stable data. The backlit LCD display shows the measurement results clearly even in the dark. Come with a soft rubber case, which adopts non-slip design to better protect the meter. The air speed tester is the ideal tool for measuring the air velocity of home, office, car, air conditioning, exhaust fan, sailboat, navigation etc. Features: 1. Conversion of 5 air speed units: m/s, foot/m, mph, km/h, knots; conversion of 2 units of air temperature: /. 2. Measured by 6-leaf wind wheel with low friction bearing design, the meter has high sensitivity and stable data. 3. The backlit LCD display shows the measurement results clearly even in the dark. 4. Come with a soft rubber case, which adopts non-slip design to better protect the meter. 5. Ideal tool for measuring the air speed of home, office, car, air condition, exhaust fan, sailboat, navigation etc. Specification: Model No.: GM818 Specification of air speed: Range: 0-30 m/s, 0-90 km/h, 0-5860 ft/min, 0-65 mph. Resolution: 0.1 m/s, 0.4 km/h, 19 m/min, 0.2 mph, 0.2 knots. Threshold: 0.1 m/s, 0.4 km/h, 39 ft/min, 0.2 km/h, 0.1 knots. Accuracy: ± 5%. Air temperature specifications: Thermometer: NTC thermometer. Range: -10~45℃(14℉~13) Resolution: 0.2, 0.36 Accuracy: ± 2, ± 3.6 Current consumption: about 3mA Storage temperature: -40 ~ 60, -40 ~ 140 ° F Operating humidity: ≤ 90% RH Battery: CR2032 3.0V battery (not included). Item size: 50 x 22 x 112.1 mm/1.97 x 0.87 x 4.41 inches. Weight: approx. 97 g/3.4 oz. Package contents: 1 x anemometer. Note: Due to the difference between different monitors and lighting effects, the pictures may not reflect the actual colour of the item. Package List