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Check the listing for details. Anemometer Wind Speed Gauge Cup Digital Professional Small Average Wind. Condition: New. Listed at 22.08 USD. A/B: Wind speed function for key, used to between (A) instantaneous wind speed and (B) average wind speed. C/D/E: Wind level power bear for key, used to between (C) instantaneous wind level (D) and equal wind level (E) corresponding waving height.