本机试法是以规定重量之钢球调整在一定的高度，使之自由落下，打击试料，视其受损程度，来判断质量。适用于塑胶、陶瓷、压克力、玻璃纤维等材料及试验涂料之坚牢度。 Specially test materials of plastic, china, acrylic, glass, plastic,....etc. The steel ball with definite weight dropfreely from definite height to strike specimen for judging quality.