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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.
First unit: millimeter (mm) is used for measuring length. Second: micrometer (Âµm) is unit of length. The micrometers unit number 1,000.00 Âµm converts to 1 mm, one millimeter. It is the EQUAL length value of 1 millimeter but in the micrometers length unit alternative.