Checkline JD-100 [JD-100-E] Digital Thickness Gauge, Range 0 - 10 mm / 0.4 inch, Depth Of Jaw 100 mm / 4 inch, Feeler E For Sheet Metal. Measuring range 0 - 10 mm / 0 - 0.4 Inch, Resolution 0.01 mm / 0.001 Inch, Thickness gauge to determine the thickness of leather, textiles, cardboard, felt, rubber, sheet metal, foil, plywood, plastic, etc.