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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.
Smaller units are the realm of the scientist and engineer. One micrometer (symbolized Âµm or Âµ), also called a micron, is equal to 0.0001 (10-4) cm. One nanometer (nm) is equal to 10-7 cm. One AngstrÃ¶m unit (symbolized Ã¤) is equal to 10-8 cm, or 0.1 nm.