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| Specification(mm) | Flatness of working surface & parallelism of opplsite surface | Squareness between working surface | Tolerance of H.W between matched pair | |||
| Grade(um) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 160x25x16 | 1.5 | 3 | 20 | 40 | 1.5 | 3 |
| 250x40x25 | 2 | 4 | 30 | 60 | 2 | 4 |
| 1000x160x50 | 4 | 6 | 40 | 80 | 4 | 8 |
| 1600x250x80 | 6 | 12 | 50 | 100 | 6 | 12 |
Granite Parallel Ruler