Micrometers can only be used for taking measurements. And, as mentioned, calipers can often be used to make different kinds of measurements (inner dimensions, outer dimensions, depths), while micrometers are usually singular-task tools.

What are micrometer calipers used for?

Micrometer, in full micrometer caliper, instrument for making precise linear measurements of dimensions such as diameters, thicknesses, and lengths of solid bodies; it consists of a C-shaped frame with a movable jaw operated by an integral screw.

When should you use a micrometer?

The proper way to use a micrometer is to hold it in your dominant hand. Grasp the thimble between your thumb and index fingers. Place the C-shape of the frame against your palm. Finally, partially wrap your pinky or ring finger within the inside of the frame.