Hand-held Wind Speed Gauge Anemometer Digital Average Wind Speed for Measuring Wind Instantaneous Wind Speed Features: Can be widely used in agriculture, forestry, environment, ocean, school teaching and other fields. This instrument is a handheld wind cup anemometer with low power consumption design, LCD display, energy saving and clear display. The instrument uses a new type of microcomputer technology with high sensitivity and fast calculation speed. The five parameters of instantaneous wind speed, average wind speed, instantaneous wind level, average wind level, and corresponding waving height can be measured simultaneously. This instrument has the advantages of small size, light weight, complete functions, low power consumption and convenient operation. Specifications: 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 for Key 1. A/B: Wind speed function for key, used to switch between (A) instantaneous wind speed and (B) average wind speed. 2. C/D/E: Wind level power bear for key, used to switch between (C) instantaneous wind level (D) and equal wind level (E) corresponding waving height. 3. HOLO: Lock function for key, used to lock the current measured value and return to the lock. 4. ON/OFF: The power switch for key is used to turn the instrument power on and off. Package List: 1 x Wind Speed Meter