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| Type(mm) | Squareness between adjacent measuring surface | strainghtness of measuring surface | Parallelism between opposite meauring surface | |||
| Precision Grade (μm) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 160X160 | 2 | 4 | 0.8 | 1.7 | 2 | 4 |
| 200X200 | 2 | 4 | 0.9 | 1.8 | 2 | 4 |
| 250X250 | 2.2 | 4.5 | 1 | 2 | 2.2 | 4.5 |
| 315X315 | 2.6 | 5.2 | 1.1 | 2.3 | 2.6 | 5.5 |
| 400X400 | 3 | 6 | 1.3 | 2.6 | 3 | 6 |
| 500X500 | 3.5 | 7 | 1.5 | 3 | 3.5 | 7 |
granite square ruler