Electronic extensometer gauge is within the scope of the sample in a continuous deformation sensor acquisition. According to GB / 12160-2002 / ISO9513; 1999 "uniaxial testing extensometer calibration" standard, now widely used is the accuracy of 0.5% of indicated value, the series resistance strain gauge extensometer for a variety of standard samples deformation measurements from within, can be composed with a measuring amplifier, strain gauges and other secondary instrument deformation measurement system within the deformation of the specimen gauge accurately measured, and the signal input to a computer or data logger function processing and rendering test curve, Mechanical testing is necessary modern measuring instruments. Specifications extensometer gauge (mm): 25,50,100,200,500, 600; range (mm): 2.5,5,10,15,20,25 this series usually consists of electronic extensometer edge clamping institutions (rubber band, horizontal spring, radial retainer), arm and elastomer. Elastomer posted a group consisting of a resistor and a full bridge strain gauge. In front of the arm is equipped with gauge positioning mechanism, with a pin to accurate positioning. When a test is running, on the sample fixed extensometer, then be sure to disconnect the pin, extensometer engraved on the edge with the deformation of the sample specimen and produce a relative displacement, deformation caused elastomers composed wholly That strain gauge bridge output signal distortion.