3 Piece Set 8 Spring Divider A divider caliper can be used to measure circles or arcs They can also be used as mapping tools to measure the distance between two points, 8 Inside Caliper This measuring caliper can be used to measure or gauge the internal size or opening of an object That measurement can then be transferred to a ruler, 8 Outside Caliper This transfer tool can be used to measure the thickness and exterior diameter of an object They are able to measure large distances such as a pipe or other circular materials.