Bristle and string due to the hardness difference, it needs to be classified for producing for different use and production stability testing. To bend specimen by grip to obtain reaction force to measure its strength value. This tester can set the length distance of specimen at 1、5、10、15、20、25、50, and can be tested with 5゜、7.5゜、15゜、30゜、90゜etc. different conditions. Select a fit length and angle according to different specimen, to test its max. bending force and determine the hardness of specimen.