Electric Universal Material Testing Machine Touch Screen Universal Tensile Strength Testing Machine, Tensile Tester tensile tester for sale pplicable Testing Standards ASTMD903, ASTM D412, GB/T16491,GB/T1040,GB/T8808,GB13022,GB/T 2790/2791/2792, CNS- 11888,JIS K6854, PSTC-7, ISO 37, ISO 1798, BS EN 1979, BS EN ISO 1798 etc.   Theory: This machine is a kind of electric tensile tester which uses the motor to drive ball …