Excellent tool for windsurfing, sailing, fishing, kite and mountaineering Professional for measuring air speed and air temperature accurately LED backlight design for operation in poor lighting This handy palm sized Anemometer with strap for easy carrying Other features include wind hold mode, wind mean mode and low battery indicator Features: Model: GM816. Color: show in pictures. Size: 105 * 40 * 18mm. Material: plastic and metal. Range: 0 - 30 m / s, 0 - 90 km / h, 0-58 60ft / min, 0 - 65 mph, 0 - 55Knots. Resolution: 0.1m / s, 0.3km / h, 19ft / min, 0.2mph, 0.2Knots. Air temperature: -10 ° C to + 45 ° C, 14 ° F ~ 113 ° F. Resolution: 0.2 ° C, 0.36 ° C. Accuracy: ± 2 ° C ± 3.6 ° C. Operating temperature: -10 ° C to + 45 ° C (14 ° F ~ 113 ° F). Operating humidity: less than or equal to 90% RH. Measure wind speed and temperature. Current / max / average reading of wind speed. Display of temperature in degrees Celsius Fahrenheit. Unit of speed wind speed: m / s, km / h, ft / min, knots, mph. The wind speed in the Beaufort wind scale bar graph. Large Easy to read LCD display with backlight. Auto / manual power off. wind chill indication. Low battery indication. / p Powered by 3V CR2032 battery. Package includes: 1 * Anemometer (with battery). 1 * Manual of the 'user. 1 * neck strap. Note: this does not include other things, the color is based on the first picture and other pictures only show the effect Due to the differences between different monitors, the im age may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!