The vernier caliper provides the three basic functions of inner, outer and depth gauge. In all cases the measurement is read from the same scale. The vernier caliper is first set over the object to be measured with the caliper shut so that it is firm but not tight.
A variation on the standard vernier caliper shown above is the dial gauge vernier. Here the measurement in whole mm is read from the main sliding gauge and the fraction of a mm is read from the dial.
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