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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.
What is a Micrometer. In a micrometer, the object to be measured is placed between the jaws and the thimble is rotated until the jaws move together and clasp the object. A screw attached to the thimble rotates along with it and allows for precise values of distances to be read off from the scale.orking Principle of Vernier Caliper and Micrometer. Vernier calipers use a sliding vernier scale to measure small movements of its jaws. Micrometers use a screw to amplify small movements of its jaws to larger movements of the rotating scale.