1) Easy to measre and test the depth of pit or others tire tread.
2) Thin and long measre rod.
3) Zero-setting at any positioin.
| Measure Range | Item No. | Resolution | Accuracy | L | a | b | d | Referance Draw# |
| 0-25mm | 121-002 | 0.01mm | ±0.02mm | 90 | 60 | 2 | 14.5 | (1) |
| 0-30mm | 121-003 | 0.01mm | ±0.02mm | 125 | 60 | 2 | 14.5 | (2) |
| 0-50mm | 121-005 | 0.01mm | ±0.02mm | 130 | 100 | 3 | 14.5 | (2) |
| 0-100mm | 121-010 | 0.01mm | ±0.03mm | 180 | 100 | 3 | 14.5 | (3) |
| 0-150mm | 121-015 | 0.01mm | ±0.03mm | 230 | 100 | 3 | 14.5 | (3) |
