YT331 High Definition Full View Digital Anemometer 1. Wind speed measurement range: 0.7-30ms 2. Wind speed accuracy: -+3%+0.1 3. Power supply: 3 x 1.5V AAA batteries (not included) 4. Screen: High-definition full-view FSTN screen, three-color backlight 5. Temperature measurement range: -20 degrees Celsius to 60 degrees Celsius 6. Humidity measurement range: 0% to 99.9% 7. Integrated wind speed, ambient temperature, and humidity detection 8. One-button switching between 6 wind speed units, supports CelsiusFahrenheit conversion 9. Three-color backlit wind speed warning, intuitively judging wind force level 10. Automatically records maximum, minimum, and average wind speed within the measurement period for easy recording of measurement values 11. Compact ergonomic design for one-handed use, built-in rotating wind cup sensor for accurate airflow capture 12. Suitable for various wind and environmental monitoring scenarios, including HVAC duct inspection, sailing, kite flying, wind power station inspection, outdoor mountaineering, factory ventilation, greenhouse planting, and fan equipment calibration.