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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.
In other words, it can be used to measure work where the part to be measured is 1 inch or less. A 2 inch micrometer will only measure work between 1 and 2 inches thick. A 6 inch micrometer has a range of from 5 to 6 inches, and will only measure work between 5 and 6 inches thick.n other words, it can be used to measure work where the part to be measured is 1 inch or less. A 2 inch micrometer will only measure work between 1 and 2 inches thick. A 6 inch micrometer has a range of from 5 to 6 inches, and will only measure work between 5 and 6 inches thick.