What is a dial caliper?

An easier to use version of the vernier caliper is the dial caliper,USCS calipers commonly measure dimensions from 0 to 6 inches. Metric dial calipersusually measure from 0 to 150 mm in increments of 0.02 mm. the dial caliper features a depth scale , bar scale, dial indicator , inside measurement jaws, and outside measurement jaws.
The main scale of a USCS dial caliper is divided into one-tenth(0.1) inch graduations. The dial indicator is d divided into one-thousandth(0.001) inch graduations. Therefore , one revolution of the dial indicator needle equals one-tenth inch on the bar scale.
A metric dial caliper is similar in appearance but the bar scale is divided into 2-mm increments. Additionally , on a metric dial caliper, one revolution of the dial indicator needle equals 2mm.
Both USCS and metric dial calipers use a thumb-operated roll knob for fine adjustment. When you use a dial caliper always move the measuring jaws backward and forward to center the jaws on the object being measured .Make sure the caliper jaws lay flat on or around the object . If the jaws are titled in any way, you will not obtain an accurate measurement.