| Code | Material | Features |
|---|---|---|
| UFD-KPA | 20# | lateral resolution (angle), longitudinal resolution (depth), short-defect resolution |
| UFD-KPB | 20# | lateral dimensional error, longitudinal dimensional error, sector angle error, angular resolution |
| Code | Material | Features |
|---|---|---|
| UFD-KPA | 20# | lateral resolution (angle), longitudinal resolution (depth), short-defect resolution |
| UFD-KPB | 20# | lateral dimensional error, longitudinal dimensional error, sector angle error, angular resolution |