| - | Features |
|---|---|
| #1 | Forged of special caliper steel |
| #2 | Hardened and tempered bow springs and fulcrum spools assure uniform tension without side play |
| #3 | Adjusting screw has a self-seating washer and nut to permit quick and positive adjustment |
| #4 | Hardened measurement face |
| #5 | Meets government specifications GGG-C-95 |