The components of the vernier caliper

A vernier caliper consists of an L-shaped member with a sclae engraved on the long shank. A sliding member is free to move on the bar and carries a jaw which matches the arm of the L. The vernier scale is engraved on a small plate that is attached to the sliding member. Perhaps the most distinct advantage of the vernier caliper, over other types of caliper, is the ability to provide very accurate measurements over a large range. It can be used for both internal and external surfaces. Pocket models usually measure from zero to 3 in., but sizes are available all the way to 4 it. In using the vernier caliper, you must be able to measure with a slide caliper and ba able to read a vernier scale.