- Measure wall thickness of tubes
- Graduation 0.01mm
- Ratchet stop
- Carbide spindle tip
- Supplied with setting standards (except 0-25mm)
| Code | Range | Type | Accuracy | L | b |
| 3261-25A | 0-25mm | A | 6μm | 31 | 24 |
| 3261-50A | 25-50mm | A | 6μm | 57 | 32 |
| 3261-25BA | 0-25mm | B | 6μm | 31 | 24 |
| 3261-50BA | 25-50mm | B | 6μm | 57 | 32 |
| 3261-25CA | 0-25mm | C | 6μm | 31 | 24 |
| 3261-25DA | 0-25mm | D | 6μm | 31 | 24 |