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micrometer screw
A micrometer screw is a finely threaded screw with a graduated head, which is used to measure a small distance by showing exactly how far the screw has been moved in or out. (noun)
An example of a micrometer screw is what someone would use with a micrometer to find out the exact thickness of a piece of wood.
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See micrometer screw in Webster's New World College Dictionary