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Pencil hardness grade:6B 5B 4B 3B 2B B HB F H 2H 3H 4H 5H 6H 7H 8H 9HFrom soft to hard, according towolff-WilbornThe hardness specification is a sequential test from soft to hard, and pencils that leave scratches are considered final“Wolff-wilbornHardness”Mitsubishi Hardness Test Pencil is an industry pencil hardness tester
characteristic:
Mitsubishi Pencil for Testing Film Hardness in Japan,Appearance is red,include9H-6Bcommon16Type specifications,Each specification is packaged in a plastic box,A box of twelve, 2H、3HWaiting for several commonly used specifications
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