In the metalworking field, a divider caliper, popularly called a compass, is used in the process of marking out locations. The points are sharpened so that they act as scribers, one leg can then be placed in the dimple created by a center or prick punch and the other leg pivoted so that it scribes a line on the work piece’s surface, thus forming an arc or circle.

A divider caliper is also used to measure a distance between two points on a map. The two caliper’s ends are brought to the two points whose distance is being measured. The caliper’s opening is then either measured on a separate ruler or then converted to the actual distance, or it is measured directly on a scale drawn on the map.

8″ 200mm Divider Caliper Wing Compass Metal Marking Circles Machinist Wood SIZE: 8” 200mm Compass a drawing instrument used for drawing circles and arcs. Wing Compass a compass, often large, for scribing arcs and circles, with an armed wing that helps to steady the legs in use, and with a locking screw on the arc to hold the legs firmly in position. Divider a drawing instrument similar to a compass but with two points, used for dividing lines and stepping off distances.