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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.
Frame size starts at one inch and goes up to as large as 24 inches. The size of an outside micrometer tells the largest size it will measure.The range of a 1 inch micrometer is from 0 to 1 inch. A 2 inch micrometer has a range from 1 to 2 inches.That is, a 2 inch micrometer will only measure work between 1 and 2 inches thick. A 6 inch micrometer has a range from 5 to 6 inches. It will only measure work between 5 and 6 inches thick.Inside and depth micrometers also have a 1 inch maximum screw movement.Extension rods are used to measure larger sizes. For example, a depth micrometer fitted with a 2 inch rod will measure depth between 2 and 3 inches.rame size starts at one inch and goes up to as large as 24 inches. The size of an outside micrometer tells the largest size it will measure.The range of a 1 inch micrometer is from 0 to 1 inch. A 2 inch micrometer has a range from 1 to 2 inches.