Features: The anemometer can measure wind speed ranges 0.9-67.0mph (resolution 0.1mph), and the measurement temperature ranges is 32℉-122℉ (0℃~50℃). The high accuracy of the anemometer can help you with HVAC installation, CFM calculations, and duct. The anemometer can measure different wind speed, such as maximums and current wind speed. 5 wind speed unit can be switched. wind level level is clear, so you know the current wind level level. The anemometer is small and delicate in appearance, so you can carry it with you. Optional automatic power-off modes, which automatically turn off after 10 minutes to save battery power. Backlit screen allows you to see clearly in the dark. This unit is a portable high-precisions digital anemometer. It can measure wind speed,air volume and air temperature. Perfect for engineers and technicians who need to measure wind speed, air volume, and environmental temperature and humidity, playing an important role in indoor and outdoor environment monitoring and debugging. Specifications: Working height: 2000m Measurement method: fan sensors Maximums display: 9999 Sampling rate: about 0.4 seconds Working current: 5mA Power supply: 1.5V 2pcs AAA (not included) Operating humidity: 0~85% RH Storage temperature: - 10~60 ℃ Storage humidity: 0~80% RH Package Includes: 1x Digital Anemometer note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.