Abstract: Disclosed herein is a measuring device with a rotary visually readable dial for determining discrete measurements of linear displacement between the finger caliper and the indexing caliper jaws of the measuring device. A gauge slide bar provides a rack which drives a set of gears. One of the gears in the gear train is spur gear which is mounted to the rotary indicia bearing dial, so that as the gauge bar slide reciprocates within the compartment formed by the caliper cover and base, the indexing caliper linear displacement is tracked by the indicia provided on the rotary dial for both English and metric measurement.Also shown is a one piece card which defines an aperture formed into a staircase pattern to discretely define varying sizes of nuts or bolt heads.