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| Type(mm) | Squareness between measuring surface and datum surface | Flatness and strainghtness of measuring surface | Flatness and straightness of datum surface | |||
| Precision Grade (μm) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 100X63 | 2 | 4 | 1 | 1 | 1 | 1 |
| 160X100 | 2 | 4 | 1 | 2 | 1 | 1 |
| 250X160 | 2.5 | 5 | 1 | 2 | 1 | 2 |
| 400X250 | 3.5 | 7 | 1 | 2.5 | 1 | 2 |
| 630X400 | 4.5 | 9 | 1.5 | 3 | 1 | 2.5 |
| 1000X630 | 6 | 12 | 2.5 | 5 | 1.5 | 3 |
granite angle square