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Difficult to explain without diagrams, but the micrometer relies on an accurate screw which advances the caliper a precise amount with each revolution. So you turn the screw until the object is lightly held, then read the axial scale and add on for the number of screw turns above the nearest scale reading. The most accurate type also have a vernier scale for very small distances. I suggest you look at Wikipedia 'Micrometer' which has a thorough explanation with diagrams.

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16y ago

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