Checkline FD-200-25 [FD-200-25-A] Digital Thickness Gauge, Range 0 - 25 mm / 0 - 1.00 inch, Depth Of Jaw 200mm, Feeler A For Rubber, Felt, Soft Materials, Non Wovens. Measuring Range: 0 - 25 mm / 0 - 1.00 inch, Jaw Depth: 200 mm / 7.87 inch, Resolution: 0.001 mm / 0.0001 inch. The FD-200-25 thickness gauge features an easy to read digital display along with the high accuracy. The digital thickness gauge 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 FD-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.