The Frankford Arsenal 6" Dial Caliper is a necessary tool for the many measurement tasks required for precision reloading. Comes shipped in a protective hard case.
- Knob at bottom of dial face can be loosened to allow face to turn and thereby 'zero' the caliper
- The screw should then be tightened to keep the setting
- Knob at top of caliper can be tightened to lock down a measurement