Micrometers (Screw-Type Gage) use a screw thread to make accurate and repeatable precision measurements.
Come in metric or inch, size ranges, with or without vernier. Digital or analog.
Outside

On many metric micrometers, the barrel scale is graduated in half millimeters and the dial reads to the nearest .01 mm.


Vernier Scale on Micrometers
Some micrometers add a vernier scale to increase their resolution.
Depth
Inside

Specialty
Screw Thread Micrometer

Taper Micrometer

Blade Micrometer
Tube Micrometer
Caliper Type Micrometer
Point Micrometer
V-Anvil Micrometer
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