To solve the problem that a correct stress-strain curve can not be obtained by a prior art tensile test system when the mechanical characteristics of fragile fibers are determined and the Young's modulus and the tensile strength of the fiber can not be determined simultaneously, and to provide an improved equipment and a test method.

Young's modulus and tensile strength of a fiber can be determined simultaneously by combining a tensile test machine available in the market with a gauge seal set 10 and a planar permanent magnet 7 fixed to a slide in order to stabilize the orientation of the gauge seal.