Technical specification of granite square rule:
| Specification(mm) | Verticality of two adjacent sides | Linearity of measuring surface | Parallelism of opposite measuring surface | |||
| Precision grade (um) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 160×160 | 2 | 4 | 0.8 | 1.7 | 2 | 4 |
| 200×200 | 2 | 4 | 0.9 | 1.8 | 2 | 4 |
| 250×250 | 2.2 | 4.5 | 1 | 2 | 2.2 | 4.5 |
| 315×315 | 2.6 | 5.2 | 1.1 | 2.3 | 2.6 | 5.5 |
| 400×400 | 3 | 6 | 1.3 | 2.6 | 3 | 6 |
| 500×500 | 3.5 | 7 | 1.5 | 3 | 3.5 | 7 |
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