A caliper is a tool that is used to measure the thickness of an object. It is composed of two arms that are connected at one end by a hinge. One arm of the caliper has a measuring scale on it, while the other arm has a pointer. To use the caliper, the object to be measured is placed between the arms of the caliper, and the hinge is opened until the pointer on the second arm rests against the object. The measurement can then be read from the scale on the first arm.
Caliper measurements are used in many different fields, such as engineering and medicine. In engineering, calipers are used to measure the thickness of materials, such as metal sheets and pipes. In medicine, calipers are often used to measure the thickness of a person's skin.