The main scale, which is marked in units that actually correspond to units in our system of measurement, is used to measure up to 1/20th or 1/40th of an inch, depending on the variety of vernier ...

Vernier Caliper Shootout The selection of calipers under test. Left: sub £1 plastic Vernier caliper, centre: Mitutoyo 530-122 Vernier caliper, right: cheap digital caliper.

Use of electronics and capacitive-based position sensing have transformed the caliper, a fundamental and essential instrument of precision linear-dimension measurement. Part 1 of this FAQ looked ...