This instrument has the advantages of small size, light weight, comprehensive functions, low power consumption and convenient operation. Can be widely used in agriculture, forestry, environment, ocean, school education and other fields. This instrument is a handheld wind anemometer with low power consumption design energy, an LCD screen, energy saving and a clear display. The five parameters which are the instantaneous wind speed, the average wind speed, the instantaneous wind level, the average level of wind and the corresponding ripple height can be measured simultaneously. The instrument uses a new type of microcomputer technology with high sensitivity and fast calculation speed. Element type: Wind speedometer Material: ABS Size: Length: approx. 24.7cm / 9.7inch Width: Approx. 9.9 cm / 3.9 inches Battery model: 3 AA batteries shipped (shipped without batteries) Four, method of use Function key Description: 1. A / B: Wind speed function key, used to toggle between (A) instantaneous wind speed and (B) average wind speed. 2. C / D / E: Wind level power bear key, used to toggle between (C) instantaneous wind level (D) and corresponding ripple height of equal wind level (E). HOLO: Lock function key, used to lock the current measurement value and return to the lock. 4. ON / OFF: The power switch is used to turn the instrument on and off. Package list: 1 x wind speed meter Note: this does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!