1. 5 air speed unit conversion: m/s, ft/m, mph, km/h, Knots; 2 air temperature unit conversion: & 8451;/& 8457;. 2. 12 levels air speed indication - You don't need to make complicated conversion from value to wind scale. 3. With backlight for easy reading at darkness. 4. Overall air speed display at MIN/Max/AVG. 5. Lightweight with small volume, easy and convenient to use. 6. Perfect tool for measuring air speed at home, office, car, air condition, exhaust fan, sailboat, navigation, etc. Specifications: Air Speed: Range: 0-45 m/s, 0-140 km/h, 0-8800 ft/min, 0-100 mph, 0-88 Knots Resolution: 0.1 m/s, 0.3 km/h, 19 ft/min, 0.2 mph, 0.2 Knots Threshold: 0.3m/s, 1 km/h, 60 ft/min, 0.7 mph, 0.6 Knots. Air Temperature: Range: 0-45& 8451;, 32°F-113& 8457; Resolution: 0.2& 8451;, 0.36& 8457; Accuracy: ±2& 8451;, ±3.6& 8457; Operating Temperature: -10°C-50& 8451; / 14-122& 8457; Operating Humidity: 40% RH - 85% RH Storage Temperature: -20-60& 8451; / -4-140& 8457; Input Current: 3mA Power Supply: 1 x 9V 6F22 Battery (NOT included) Type:Tachometer name:Digital Anemometer Wind Colour:As Shown Material:plastic Package Contents: 1 * windmill 1 * host(Battery is NOT included)   window.adminAccountId=247856428;