BY-750g Pencil Hardness Tester's video
NBCHAOVIDEO4211 plays · · 2018-12-11
PUSHEN BY-750g Pencil Hardness Tester with a load of 750g is designed and manufactured according to the national GB/T6739-2006 standard and with reference to foreign congeneric products. It measures the Hardness of the film with the Hardness label of the pencil.
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