This tester is used to evaluate the bursting strength of paper, paper board, liner film, cardboard, rubber, and plastic film. The operator is to tighten the test specimen to the tightening board and pressurize it with a rubber membrane mediator. The maximum pressure when the test specimen bursts will be the bursting strength of the test specimen. The user is to choose the high pressure type or the low pressure type according to the thickness and the bursting strength of the test specimen.