Checkline DMD-3 [DMD-3-G] Digital Thickness Gauge, Range 0 - 0.4 in (0 - 10 mm), Jaw Depth 50 mm, Feeler G Very Rigid Material. Measuring Range: 0 - 0.4 in (0 - 10 mm), Resolution: 0.0005 in (0.01 mm), Jaw Depth: 1.97 in (50 mm). The Checkline DMD-3 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.