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Apply for headphone tensile test,clamping the headphone,fasten one end of earphone, headband clamping on support rod,the other end of earphone fix on the fixture of the digital tensile gauge, control the screw ball move right,the digital tensile gauge will show the tension data(can reserve the max tension),by this way to check the relation between tensile distance and tension once user pull back the headphone onto the head.