Mini Size& Portable Design - Compact and lightweight, you can keep it in pocket. Come with a yellow protective case and wrist strap. The rubber outer case provides good protection, and the wrist strap ensures you don't lose the anemometer in a strong wind. Multi-Function - Provides fast wind speed and temperature measurement for analysis of critical environment conditions Data Hold Function; High Precision Pressure Sensor; Air velocity; wind speed and temperature measurement; / temperature selection; Current / max / average wind speed reading Data Hold Function; Auto/ Manual Power Off; Low battery indication. Power Saving - Powered by a 3V CR2032 battery( included ), It has a low battery indicator with Manual/Auto Power Off functions. Versatility - Our anemometer is ideal for home purpose such as measuring wind speed, air blower, temperature of CPU computer fans, and also can be used for windsurfing, sailing, fishing, kite flying and mountaineering. Suitable for power industry, steel industry, petrifaction industry, manufacturing industry, etc.. Backlight LCD Display - This handheld digital wind speed anemometer with a large LCD screen can display the data clearly. Back-light makes you easy to read and accurate in low light areas or night.