- The end of the main beam is hook-shaped to allow depth and thickness measurements of a projected portion or lip in a hole, in addition to standard depth measurement.
Specifications:
| Order No. | Range | Vernier Reading | Accuracy | Mass | Remarks |
| 527-401 | 0-150mm | 0.05 mm | 0.05mm | 240g | – |
| 527-402 | 0-200mm | 0.05 mm | 0.05mm | 240g | – |
| 527-403 | 0-300mm | 0.05 mm | 0.08mm | 270g | – |
| 527-411 | 0-150mm | 0.02 mm | 0.03mm | 280g | with fine adjustment |
| 527-412 | 0-200mm | 0.02 mm | 0.03mm | 300g | with fine adjustment |
| 527-413 | 0-300mm | 0.02 mm | 0.04mm | 350g | with fine adjustment |
