Pencil hardness rating 6B 5B 4B 3B 2B B HB F H 2H 3H 4H 5H 6H 7H 8H 9H From soft to hard, according to the wolff-Wilborn hardness specification, it is a sequential test from soft to hard, the first pencil that will leave scratches is regarded as the final "Wolff-wilborn pencil hardness", Mitsubishi hardness test pencil is the industry's preferred test pencil for pencil hardness testing.
Model: UNI (6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H)
17 types in total (red/blue optional)
(Available in English and Japanese)
