The majority of the proposed models concern the tension test of reinforcing bars. In particular, the High capacity steel tensile testers have been specifically designed to test reinforcing bars. The front loading of specimens, the hydraulic gripping system, the remote control and the fully automatic test sequence make these tester the ideal solution for Central Laboratory for construction materials. However, some of the machines can be used for many other applications for testing flexible and elastic materials such as plastics, textiles, rubber, wires etc. Most of the machines are controlled by PC assuring a simplification and rationalization of test procedures with all the other advantages associated with the use of the most modern electronic and informatics techniques.