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The compact vane anemometer in combination with a smartphone or tablet is suitable for measuring airflow velocity, the temperature at air outlets, and for regulating the airflow of a ventilation system. Via the Smart Probes App installed on the end device, users can comfortably read off their measurement values, configure volume flow measurements quickly and easily, and reliably determine timed and multi-point mean values. Main Features: Display: LCD display Wind Speed Unit Selection: m/s, km/h, ft/min, knots, mph Temperature measurement units: °C, °F Measure Max/Min/Average/Current value of wind speed High Precision Sensor provides more accurate measurement Auto Power Off time: 15 minutes Operating Temperature: 0~50 ℃/32~122℉ Power Supply: 4*1.5V AAA batterySpecifications: m/s(meter per second): 1~25 Accuracy: ± (3.0%reading + 0.2 m/s) ft/m (feet per minute): 196~4921 Accuracy:± (3.0% reading + 40 ft/m) km/h (kilometer per hour):3.6~90 Accuracy:±(3.0% reading + 0.8 km/h) mph(mile per hour): 2.2~55.9 Accuracy:± (3.0%reading + 0.4 mph) Knots(nautical miles per hour): 1.9~48.5 Accuracy:± (3.0% reading + 0.4 Knots) Celsius : 0°C-50°C Accuracy:± 2 Fahrenheit: 32°F-122°F Accuracy: ± 4 Dimensions (L x W x H): 6.9 x 1.6 x 1 inch Package Weight: 0.25 lbPackage Included: 1 * 2-in-1 Bluetooth Digital Anemometer 4 * AAA Batteries 1 * User Manual