Tensile strength to provide non-proportional extension force, the most vigorous, the total elongation tensile properties of parameters; stress relaxation rate, stress relaxation, relaxation performance parameters. Universal testing machine Electronic strand tension, stress relaxation testing machine (here in after referred to as test machine) is dedicated to, or priestesses steel strand tensile performance tests and tensile stress relaxation test, determination of anti-Tensile strength to provide no proportional extension force, the most vigorous, the total elongation tensile properties; stress relaxation rate, stress relaxation rate of stress relaxation performance parameters. Universal testing machine.