The components of a vernier caliper

A typical vernier caliper consists of a stationary bar and a movable vernier slide assembly. The stationary rule is a graduated bar with a fixed measuring jaw.

The vernier slide assembly combines a movable jaw, vernier plate, clamp screws, and adjusting nut. It moves as a unit along the graduations of the bar to bring both jaws in contact with the workpiece.< /p>