Wind Speed Meter Handheld with Digital LCD DisplayThis Pocket Sized Portable Anemometer is ideal for outdoor activities such as Sailing, Surfing, Hang-gliding, Drone Flying, Shooting,Walking, HVAC Duct Airflow, Air conditioners and Air blowers. It is also ideal for educational instruments.Air VelocityRange: 0 -30 m/s, 0 -90 km/h, 0 -5860 ft/min, 0 -65 mph, 0-55 KnotsResolution: 0.1 m/s, 0.3 km/h, 19 ft/min, 0.2 mph, 0.2 KnotsThreshold: 0.1 m/s, 0.3 km/h, 39 ft/min, 0.2 mph, 0.1 KnotsAccuracy: ± 5%Air TemperatureRange: -10 -45 centigrade, 14 -113°FResolution: 0.2 centigrade, 0.36°FAccuracy: ± 2 centigrade, ± 3.6°FFeaturesWind temperature range: 14-113°F ( -10 -45 centigrade)Wind speed unit: m/s, Km/h, ft/min, Knots, mphAuto / manual power offTemperature display in °F /°CLarge easy-to-read LCD display with back lightRubber protective cover, anti-skid, anti fall, durable.Quick response, external thermistorWind chill indicationHigh precision pressure sensorCurrent/max/average wind speed readingCurrent Consumption: About 3mAWind speed in Beaufort wind scale bar graph.Battery GuidanceRotate in the direction shown by the arrow to open the battery cover. (If the battery box is too tight to open, you can insert the coin into the slot to rotate.)Package Included1* GM816 Digital Anemometer1 * 3V CR2032 Battery(Included)1 * Lanyard1 * Protective Case1 * User Manual