Each model comprises a measuring head, a set of extension rods and a spacing collar to facilitate alternative measuring ranges.
The smaller models (901, 902 & 903) have detachable extension handles.
| 901M | 25-55 | 0.003 | 5 | POA |
| 902M | 50-210 | 0.003 | 10 | POA |
| 903M | 50-310 | 0.003 | 10 | POA |
| 908M825 | 200-825 | - | 25 | POA |
