Different types of measurement
There are 3 different ways to measure with calipers.
1.Measuring the external dimension of a part. To do this clamp on the outside using the external measuring jaws.
EX: Measuring the side lengths of a cube.
2.Measuring the internal dimension of a part. To do this clamp on the inside using the internal measuring jaws.
EX: Measuring the slot width or diameter of a circle in a part to confirm tolerances.
3.Measuring the depth of a part. To do this use the depth gauge at the end of the calipers.
EX: Measuring to the bottom of a threaded hole to pick out the right sized bolt.