Correct option is B
A
micrometer is a precision measuring instrument used to measure small dimensions with high accuracy (typically in the range of
0.01 mm or 0.001 inches).
Main Parts of a Micrometer:
1.
Spindle: A movable measuring surface that advances or retracts when the thimble is rotated.
2.
Anvil: A fixed measuring surface that holds the object being measured against the spindle.
3.
Sleeve (or Barrel): The stationary part of the micrometer that has a
linear scale engraved on it for reading measurements.
