Item Type: Wind Speed Meter Material: ABS Size: Length: Approx. 24.7cm / 9.7in Width: Approx. 9.9cm / 3.9in Battery Model: 3 x AA batteries shipped (delivered without batteries) Four, use method Function Key 1. A/B: Wind speed function key, used to switch between (A) instantaneous wind speed and (B) average wind speed. 2. C/D/E: Wind level power bear key, used to switch between (C) instantaneous wind level (D) and equal wind level (E) corresponding waving height. 3. HOLO: Lock function key, used to lock the current measured value and return to the lock. 4. ON/OFF: The power switch key is used to turn the instrument power on and off. 1This instrument has the advantages of small size, light weight, complete functions, low power consumption and convenient operation. 2Can be widely used in agriculture, forestry, environment, ocean, school teaching and other fields. 3This instrument is a handheld wind cup anemometer with low power consumption design, LCD display, energy saving and clear display. 4The instrument uses a new type of microcomputer technology with high sensitivity and fast calculation speed. 5The five parameters of instantaneous wind speed, average wind speed, instantaneous wind level, average wind level, and corresponding waving height can be measured simultaneously.1 x Wind Speed MeterManual measurement, for reference only.