Checkline JD-200-25 [JD-200-25-C] Digital Thickness Gauge, Range 0-1", Depth Of Jaws 200 Mm, Feeler C For Soft Leather, Cardboard. Resolution: 0.001 inch / 0.01 mm, 8" (200 mm) Jaw Depth. The digital thickness gauge serie has the benefit of an easy to read LCD display, combined with the highest accuracy. The user can select either to display thickness in mm or in inches. The JD-200-25 model is available with 5 different feelers, which can be found below. Measurement is done by a spring force. Opening by lifting device (lever) - self closing.