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| NR. | Type | Range | Resolution | Usage |
| 642-011 | XSG | 04mm | 0.01mm | |
| Measuring the condition of Deviating trapezoid screw to make sure enough length of outer screw and knowing that the screw is the screw gauge. | ||||
| 642-012 | JTG | ±2mm | 0.01mm | |
| Measure the coaxial variation between the central axis and the connecting screw of cannula and vitta. | ||||
| 642-010 | CKY | 25.6×Magnifying power of specs copy 25.6× | ||
| Measure the half screw angle of outer screw. | ||||
instrument for pipe screw thread