The Checkline DM-830-H Analog Metric Dial Thickness Gauge, Range 0 - 25 mm, Jaw Depth 300 mm, Feeler H (30 mm) for Foams and Insulating Materials is used to determine the thickness of leather, textiles, cardboard, felt, rubber, sheet metal, foil, plywood, plastic, etc. Self closing thickness gauge with high accuracy and resolution.