Best suitable for calibration of Vernier Calipers and Vernier Height Gauges of all types (Mechanical / Dial / Digital) up to 1 meter. Product Information :- Comprises of permanently wrung Gauge blocksĀ in a protective casting. Gauge Blocks are made of selected Alloy Steel, Tungsten Carbide and Ceramic. The Caliper Checker also stands perpendicular to a surface for height gauge calibration.