- Graduation 0.01mm Ratchet stop
| Code | Range | Stem | Spindle tip | Accuracy |
| 6388-50 | 0-50mm | with clamp nut | flat (carbide) | 5µm |
| 6388-50W | 0-50mm | plain | flat (carbide) | 5µm |
Large Micrometer Head Code 6388
| Code | Range | Stem | Spindle tip | Accuracy |
| 6388-50 | 0-50mm | with clamp nut | flat (carbide) | 5µm |
| 6388-50W | 0-50mm | plain | flat (carbide) | 5µm |