What are micrometers?
The micrometer is used to measure linear outside and inside
dimensions.Both outside and inside micrometers are calibrated and
read in the same manner. Measurements on both are taken with the
measuring points in contact with the surfaces being measured.
There are the frame, anvil, spindle, locknut, sleeve, sleeve
numbers, sleeve lone line, thimble marks, thimble, and ratchet on a
micrometer. Micrometers are calibrated in either inch or metric
graduations and are available in a range of sizes.
Usually, most micrometers are designed to measure objects with
accuracy to 0.001 (one-thousandth) inch. Additionally, micrometers
can also measure in 0.0001 (one-thousandth) inch. Micrometers are
also available to measure in 0.0001 (ten-thousandths) of an inch.
This type of micrometer should be used when the specifications call
for this much accuracy.