A micrometer ( /maɪˈkrɒmɨtər/ US dict: mī·krŏm′·ĭ·tər), sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers. Micrometers are often, but not always, in the form of calipers.
Colloquially the word micrometer is often shortened to mike or mic (/ˈmaɪk/) (US dict: mīk′).
Read more about Micrometer: History of The Device and Its Name, Operating Principles, Parts, Torque Repeatability Via Torque-limiting Ratchets or Sleeves, Calibration: Testing and Adjusting, Zero Error