Features: 1. 5 air speed unit conversion: m/s, ft/m, mph, km/h, Knots; 2 air temperature unit conversion: ℃ / ℉ . 2. Measured by 6-leaf wind wheel with low friction bearing design, the meter has high sensitivity and stable data. 3. LCD backlight screen displays the measuring results clearly even in dark. 4. Come with soft rubber holster, which adopts non-slip design to protect the meter better. 5. Ideal tool for air speed measurement of home, office, car, air condition, exhaust fan, sailboat, navigation, etc. Specification: Model: GM818 Air Speed Specification: Range: 0-30 m/s, 0-90 km/h, 0-5860 ft/min, 0-65 mph, 0-55 Knots Resolution: 0.1 m/s, 0.3 km/h, 19 ft/min, 0.2 mph, 0.2 Knots Threshold: 0.1m/s, 0.3 km/h, 39 ft/min, 0.2 mph, 0.1 Knots Accuracy: ± 5%. Air Temperature Specification: Thermometer: NTC Thermometer. Range: -10 ℃ ~45 ° C (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*22*112.1mm / 1.97*0.87*4.41in Weight: Approx. 97g / 3.4oz Package list: 1 * Anemometer Note: Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item.