Pro CFM Meter - Our airflow meter features a wide range of airflow CFM 0-999900, resolution of 0.001-100, and airflow area of 0.001-9999 ft2. It can help balance central air conditioning systems by reading the airflow readings throughout the house; Measures Wind from Any Direction - This cup anemometer features 3 sensitive wind cups that accurately and automatically sense wind from all directions. Unlike normal vane anemometers that require manual adjustment for accurate measurement, This cup anemometer offers unparalleled convenience and precision; Rechargeable and waterproof - This digital anemometer features a type-C port for easy charging, making it an ideal choice for long-term use or outdoor activities. It also has waterproof touch buttons for simple operation and doesn't have to worry about adverse weather conditions, making it suitable for a variety of outdoor conditions; Professional & Multifunctional - This Pro wind speed meter has functions such as: unit switching of wind speed(m/s, km/h, ft/min, knots, mph) and wind temp(℃,℉), Max/Min/Average Wind Speed, battery level display, auto off, backlight, etc. Which can meet various measuring demands; What's in the Box -1x Digital Anemometer, 1x Type-C Charging Cable, 1xScrewdriver, 1* Manual. NOTE:When using for the first time, please connect the battery according to the instructions in the manual;