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This is used to measure wind speed. Cup counter in which the run of wind in kilometers and tenths is indicated directly on a revolution counter. From the readings of the counter at the beginning and end of a specified period, either 3 minutes or one day, the mean wind speed over the period is calculated.
The instrument has a cup rotor assembly having 3 conical cups which are freely rot table in horizontal plane. The cup rotor spindle is connected to a worm and gear of a ratio and further coupled with a revolution counter, the counter has the five figures can read up to 9999.9 Kms. Before repeating itself and is enclosed in a water proof housing, which is mounted on a supporting arm.