This attachment is usually used to support samples in tensile testing. The pressure of the fixture can be precisely controlled by adjusting the air pressure, and the soft test piece will not deform or break at the two ends of the clamp. Maintain a stable force on the test piece to avoid negative deviation in test data caused by sample creep. The device of the physical property tester (physical property analyzer, texture analyzer) is suitable for testing the tensile strength of rubber/plastic dumbbell shaped specimens and other specimens.