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Home > Education >Dial Calipers Information

What are dial calipers?

The dial caliper is more easier-to-use than the vernier caliper. In general, imperial calipers can measure dimensions from 0 to 6 inches (0 to 150 mm). Metric dial calipers commonlly measure from 0 to 150 mm in increments of 0.02 mm. The dial caliper has a depth scale, bar scale, dial indicator, inside measurement jaws, and outside measurement jaws.
The main scale of an British Imperial dial caliper is divided into one-tenth (0.1) inch graduations. The dial indicator is divided into one-thousandth (0.001) inch graduations. Thus, one revoluton of the dial indicator needle equals one-tenth inch on the bar scale.
The metric dial calipers has similar appearance; but the bar scale is divided into 2-mm increments. Besides, on a metric dial caliper, one revolution of the dial indicator needle equals 2 mm.
Both English and metric dial calipers use a thumb operated roll knob for fine adjustment. Always move the measuring jaws backward and forward to center the jaws on the object being measured when you use a dial calipers. Do make sure the caliper jaws lay flat on or around the object. If the jaws are tilted in any way, you will not obtain an accurate measurement.
Although dial calipers are precision measuring instruments, they are only accurate to plus or minus two-thousandths (┬▒0.002) of an inch.