Description: Low friction bearing design for sensitive measurement and data stability LCD backlit screen, high-definition backlight design, clear and bright, convenient for night use Distribution lanyard with lanyard on the bottom to instrument loss Measure wind speed and temperature,High precision pressure sensor Perfect tool for windsurfing, sailing, fishing, kite flying and mountaineering It can also be used for industrial and home purpose such as measuring wind speed and temperature of CPU computer fans, air conditioners, air blower etc. Specifications: Product name: Speed Measuring Instrument Material:ABS Color:As is shown Power supply: Built in CR2032 3.0V button battery Model Number:RZ818 Wind velocity:0 to 30 m/s Wind Accuracy: +-5% Temperature: -10 to 45 C (14 to 113 F ) Temperature accuracy: 2 Wind chill indication: Yes C / F selection:Yes LCD back light: Yes Resolution: 0.2m/s, 0.2 Storage Temperature:Between -40C and +60C, between -40F and 140F Current Consumption:About 3mA Operating Humidity:Less than or equal to 90% RH. Size:(About) 49*21*112.1mm Package Included: 1PC x Speed measuring instrument 1PC x Hanging rope 1PC x User maunal Note: Transition: 1cm=10mm=0.39inch 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.