Electronic Crock meter

Electronic Crock meter test method is to clamp specimen on fixed seat of abrasion, wrap 5cm x5cm white cloth on the rub-hammer above the specimen, abrasion hammer diameter is 16mm, center load is 900g, abrasion distance is 10cm, with one back and forth each second speed to abrasion the specimen, total 10 times travel, taking out white cotton and use gray scale to compare of the decolorization level.