CID knows criminal measures the strength of the blow at the airport

I believe the answer is:

windsock

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(Other definitions for windsock that I've seen before include "It indicates the direction and strength of the wind at ground level" , "Indicator of air movement at airport" , "Indicator of breeze direction at airfield" , "shower of blows" , "Mounted cloth cone showing wind direction" .)

I've seen this clue in the Irish Times.

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