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The eight (not seven) main parts of an outside micrometer are:FrameBarrelThimbleSpindleAnvilRatchetLockScrew
Yes. An inside micrometer or bore micrometer can be used for measuring the bore of a machined cylinder.
Calibrating micrometers: For quick reference the supplied test piece can be used. For calibrating a micrometer, gauge blocks are used.
A micrometer is used to measure very small distances.
A machinist such as a lathe operator would use a micrometer caliper for precise measurements of the product he is machining, Also used by designers of precision parts and programmers of precision machines.