Inside calipers

The inside calipers are used to measure the internal size of an object.The upper caliper requires manual adjustment prior to fitting, fine setting of this caliper type is performed by tapping the caliper legs lightly on a handy surface until they will almost pass over the object. A light push against the resistance of the central pivot screw then spreads the legs to the correct dimension and provides the required, consistent feel that ensures a repeatable measurement. The lower caliper has an adjusting screw that permits it to be carefully adjusted without removal of the tool from the workpiece.