Checkline DMD-3-1 [DMD-3-1-H] Digital Thickness Gauge, Range 0 - 1 in (25 mm), Jaw Depth 50 mm, Feeler H (30 mm) For Foams And Insulating Materials. Measuring Range: 0 - 1 in (0 - 25 mm), Resolution: 0.0005 in (0.01 mm), Jaw Depth: 1.97 in (50 mm). The Checkline DMD-3-1 Digital Thickness Gauge 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.