Handheld Digital Anemometer Wind Speed Meter with Temperature Measurement Features: Measures Air Velocity & Temperature. Displays Max/Min/Average/Current readings. Temperature unit selection: °C/°F. Five units of air velocity: m/s, km/h, ft/min, knots, mph. Data Hold function. Backlit LCD display. Manual/Auto power shut-off. Beaufort Scale indication. Wind chill indication. Low battery indication. Specifications: Air Velocity: Unit Range Resolution Threshold Accuracy m/s 0-45 0.1 0.3 ±3% Ft/min 0-8800 19 60 ±3% Knots 0-88 0.2 0.6 ±3% Km/hr 0-140 0.3 1 ±3% Mph 0-100 0.2 0.7 ±3% Temperature: Unit Range Resolution Accuracy °C 0°C-+45°C 0.2 ±2°C °F 32°F-113°F 0.36 ±3.6°F Power Supply: 9V battery Operation Temperature: -10°C to +50°C (14°F to 122°F) Operating Humidity: 40%RH to 85%RH Storage Temperature: -20°C to +60°C (-4°F to 140°F) Storage Humidity: 10%RH to 90%RH Package Information: Main unit dimensions: 145 x 72 x 35mm Vane dimensions: 172 x 65 x 29mm Weight: 276g Package Included: 1 x Handheld Anemometer (battery not included) 1 x Instruction Manual Anemometer Wind Speed Meter Digital Wind Meter Handheld Digital Air Velocity Range 0.18-45m/s Wind Speedometer Sensor