Mahr Federal 57B Wire Insulation Thickness Gages Features:
- Using the basic design of the Model 57B-13 (Model 57B-13M —Metric) Gage, the lower contact is PT-103, 1.10 mm / .043 diameter rod, mounted horizontally. The upper contact is a flat chisel contact , in line with the rod. By slipping tubular parts onto the lower contact, the gage can measure the thickness of the wall of the tube. An auxiliary weight on the Indicator provides a total dead-load weight of 25 grams. (Replacement lower rod: PS-43)
- Dial Indicator readout