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Product Description
| Koh-I-Noor 1500 set of 20 pencils in an aluminum case to use with the Wolff Wilborn Hardness Test. Pencils ranging from 8b -2H |
When testing by Pencil Hardness - Make sure all parties are using the same BRAND of Pencil. There is no exact standard for hardness scales so pencils from different companies can give different results.
