Features: This is a stable, safe and reliable professional digital anemometer. It can measure wind speed, air volume, temperature, humidity, dew point temperature and humidity. Widely used in wind energy, meteorology, industry, agriculture, hydrology and water conservancy, environmental protection, highways, airports and ports, etc. Specifications: Precision index: Accuracy: ±(% readings + words), guarantee period of one year. Baseline conditions: ambient temperature 18 ~28℃, relative humidity < 80%. Material: ABS Size: 190x68x28mm/7.48x2.68x1.1" Model: HT625A/HT625B Operational considerations: 1. Don't touch the fan blade too hard. 2. Do not store or operate the instrument in areas with high temperature or humidity. 3. When using, do not let the strong light directly shine on the fan, in order to avoid measurement error. 4. Avoid violent vibration. 5. Remove the battery before storing the instrument for a long time.(Battery is not included) Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. Included: 1 X Anemometer 1 X USB Line 1 X CD 1 X User Manual