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In order to read a micrometer, you will use the numbers on the thimble and on the sleeve. The numbers on the sleeve are broken down into 4 parts. Think of them as dollars with whole numbers and quarters. The numbers on the thimble can be represented as pennies, or ones. If the sleeve is at 9 3/4 and the thimble is at 4, the reading would be .979.
pitch /no of divisions of micrometer barrel
Frame, Anvil, Spindle, Spindle lock, Barrel, Thimble, and Rachet.
1 millimeter = 1000 micrometer