For measuring internal diameter or internal through-groove of workpieces by comparative method. Reading can be shown on the outside micrometer
| Model No. | Measuring Range | Depth (mm) |
|---|---|---|
| TG-9001 | 8-12.7 | |
| TG-9002 | 12.7-19 | 102 |
| TG-9003 | 19-32 | |
| TG-9004 | 32-54 | |
| TG-9005 | 54-90 | 127 |
| TG-9006 | 90-150 | |
| TG-9000S | 8-150mm (Set) |
