Direct-reading dial calipers
The direct-reading dial caliper, has a dial indicator mounted on the movable jaw which provides a direct reading in inches or millimeters. The edge of the bar for the inch dial caliper is usually graduated into equal divisions spaced at intervals of .100 in., with every tenth line represented by a large number indicating inches. The indicator dial is graduated into 100 equal divisions, each having a value of .001 in. On metric dial calipers the edge fo the bar is usually graduated in millimeters, with every tenth line numbered for easy reading. The indicator dial is generally graduated into 100 equal divisions, each having a value of 0.05 mm, or as fine as 0.02mm. Dial calipers take measurements quickly and are easier to read than standard vernier calipers.