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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 micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: Î¼m) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling 1 Ã 10 â6 metre (SI standard prefix micro- = 10 â6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).