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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.
The micron, officially obsolete as a term of measurement, is sometimes used by microchip and wiring manufacturers in place of micrometer, one-millionth of a meter. The micron or micrometer can also be expressed as: