This article deals with the experimental verification of the stress distribution inside a tensile test specimen using a recently developed gripping system. The upper yield strength of materials such as low carbon steels could be extremely sensitive to the elastic stress distribution inside the test piece. The evolution of stress distribution inside the sample during elastic loading is in strong correlation with the initial alignment and gripping methodology of the test piece, so the gripping system influences strongly the value of upper yield strength. Therefore, the application of a suitable gripping system is essential if the exact value of the upper yield strength is necessary to know. In the current work a special test piece equipped by strain gauges has been used to measure the stress distribution during elastic loading of the tensile test piece. The results show that the new gripping system could provide almost pure uniaxial conditions; moreover the uniaxial or even non-uniaxial loading can be adjusted and repeated with small deviation.