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A micrometer (μm) is a distance. Things that are millionths of a meter long or thick (microbes, radio waves, hair diameter, thread, thickness of layers of paint, ...)

A micrometer is also measuring tool or instrument. A micrometer can typically measure to an accuracy of 1 thousandth of an inch or an accuracy of 1 hundredth of a millimeter. Micrometers are used by Engineers to measure and to check the size of parts which they make.

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