The Checkline DM-820-1-M Analog Metric Dial Thickness Gauge, Range 0 - 50 mm, Jaw Depth 200 mm, Feeler M (20 mm) for Rubber Sheets, Felt, Soft 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.