The Mitutoyo 515-565 CERA Caliper Checker is designed to inspect vernier, dial and Digimatic calipers. It is comprised of permanently wrung, high-grade CERA gage blocks in a protective casting. This checker also stands perpendicular to a surface for height gage inspection and the zirconia based ceramic CERA measuring blocks are corrosion resistant and dimensionally stable. This model is an Inch model with a range of 0-12". Length to check, Outside Measurement/Inside Measurement: 1",2",4",6",8",10",12".