A micrometer is a highly precise measuring instrument used to determine small linear dimensions with exceptional accuracy, commonly up to 0.01 mm or finer. Widely utilized in mechanical engineering, manufacturing, and quality inspection, it operates on the principle of a calibrated screw mechanism that converts rotational motion into precise linear movement. A standard micrometer consists of a rigid frame, anvil, spindle, sleeve, thimble, and ratchet stop, which together ensure consistent measuring force and reliable readings. It is primarily used to measure external dimensions such as thickness, diameter, and width of components, though specialized types like inside and depth micrometers are available for other applications. Typically made from hardened steel for durability and stability, the micrometer is an essential tool for high-precision work where accuracy, repeatability, and quality control are of paramount importance.