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A micrometer is a measurement device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades. The first micrometer was developed by Jean Laurent Palmer of Paris in 1848.
Depending on the type of micrometer available, a variety of distances can be measured. For example, a micrometer can measure the thickness of a wire or a sheet of paper. It could measure the diameter of a hole, the length of the surface of a nail or the depth of a slot.