The vernier caliper, is a versatile precision measuring instrument used to make accurate outside, inside, and depth measurements to within .001 in. or 0.02 mm for metric tools. A vernier system consists of a main scale on the bar and a vernier scale on the movable jaw. Although new digital tools have provided measuring instruments that are very accurate and easy to use, it is quite likely that vernier calipers will continute to be used in training programs and industry for some time. The most common vernier calipers are available in sizes ranging from 6 to 24 in.(150 to 600mm).
â—?Both external and internal measurements can be taken.
â—?The back side edge of the moveable jaw permits shoulder measurement.
â—?The depth rod, attached to the movable jaw on some models, permits depth measurement.