Elasticity ring length -measuring appliance

The utility model relates to an elasticity ring length -measuring appliance, including frame, detection device and confession power device, the frame includes first crossbeam, second crossbeam and sets up the first fixed column and second fixed column between first crossbeam and second crossbeam, and detection device hinders the regulation post with slide including linear smooth hindering, and smooth hindering is adjusted the post and be used for through sliding around hindering along the linearity cunning, adjusts linear smooth starting point end that hinders and the smooth output resistance size of adjusting between the post that hinders, supplies the power device to be used for stimulateeing to slide to second fixed column direction and hindering the regulation post according to predetermineeing big or small pulling force. The utility model discloses turn into the signal of telecommunication with the atress deformation of elasticity ring, turn into the length behind the elasticity annular strain with it ag