PPH-1000 Pencil Hardness Tester's video
NBCHAOVIDEO3803 plays · · 2016-01-26
MODERNER PPH-1000 Pencil Hardness Tester follows GB/T6739-1996 old national standard, 1000g load, used for film scratch resistance test, with level and non-slip rubber wheel and different hardness grade pencils.
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