TECLOCK Caliper Gauges

As to internal caliper gauge IM-880 series, the distance between contact points facing　outside is firstly set at standard dimension with ring gauge or micrometer. Then, it is　measured by inserting contact point into internal dimension part to be measured after　its outer dial of which moves together with rotated bezel is set at “0”. The displacement　of indicator from “0” point of outer dial is to be measured at that time. The value　adding to the read displacement to standard dimension or deducting it from standard　dimension is the dimension of internal diameter. This series attaches spare contact　point which cam set accurate dimension corresponding to size of internal dimension.
External caliper gauge is opposite, namely reading the value by holding work piece　with 2 contact points facing outside.