It can measure micrometers which are really tiny
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Yes. An inside micrometer or bore micrometer can be used for measuring the bore of a machined cylinder.
An imperial micrometer can measure to within 0.001in (1000th of an inch).
A micrometer is used to measure very small distances.
First calibrate the micrometer by dialing the spindle to zero and adjusting the anvil until it is flush against the spindle. Measure the screw until the ratchet begins to click and take the first reading. This reading can then be compared to a machining book to verify the pitch diameter.
The eight (not seven) main parts of an outside micrometer are:FrameBarrelThimbleSpindleAnvilRatchetLockScrew