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micrometer
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length measurement device incorporating a calibrated screw
A micrometer is a precision measuring tool that uses a calibrated screw to measure very small lengths with high accuracy. It matters because many manufacturing and scientific applications require precise measurements that other rulers or measuring devices cannot provide.
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Modern micrometer with a reading of 1.639 ± 0.005 mm. Assuming no zero error, this is also the measurement. (One may need to enlarge the image to read it.) Outside, inside, and depth micrometers. The outside micrometer has a unit conversion chart between fractional and decimal inch measurements etched onto the frame.
A micrometer (/maɪˈkrɒmɪtər/ my-KROM-it-ər), sometimes known as a micrometer screw gauge (MSG), is a device incorporating a calibrated screw for accurate measurement of the size of components. It is widely used in mechanical engineering, machining, metrology and most mechanical trades, along with other dimensional instruments such as dial, vernier, and digital calipers. Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame). The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.