Product Highlights The 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. The CERA Caliper Checker also stands perpendicular to a surface for height gage inspection. The zirconia based ceramic CERA measuring blocks are corrosion resistant and dimensionally stable. Range 0-600mm Mass 8.5kg Outside measurement,Inside measurement:20, 50, 100, 150, 200, 300, 400, 500, 550, 600mm