Micrometer - Wikipedia
A micrometer (/ m aɪ ˈ k r ɒ m ɪ t ər / my-KROM-i-tər), sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for precise measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, …