The user needs to input the number and diameter of the steel bars in advance, the machine wil automaticaly generate the tensile strength,automaticaly stop when theuser's rated tensile strength is reached, and it can store the parameter records of each prduct on the shift for archival sampling. The stretching length can refer to the scale range. It moves back and forth, up and down by hydraulic control, safe and reliable, and responds quickly. The left and right movement is controled by the motor. The main electrical unit of this machine is controled by the console and also equipped with a remote control cable buton for easy operation.