What does a vernier calliper measure?

A vernier caliper is a precision measuring instrument that can measure multiple dimensions accurately. Its design allows it to measure lengths, outside diameters, inside diameters, and depths of holes. The instrument features a main scaled jaw for measuring external dimensions and a secondary scale (the sliding jaw) that can be adjusted to measure internal dimensions and depth.

The versatility of a vernier caliper comes from its ability to take advantage of the two sets of jaws and the depth rod, making it a critical tool in engineering and manufacturing where precise measurements are essential. This capability sets it apart from other measurement tools that may be limited to specific dimensions, which is why the correct choice encompasses all these measurement functions.