... Curtain Balance 3.double head Automatically Curtain Checking Machine The development of Elevator is for the convenience ... lenth,width,linear,polution,and so on.the max height is 3.3m,up and down automatically. This ... is concise,easy to operate,mechanical structure.Each machine only one operator can comprehensive inspection to every ... can reach more than 3M check curtain height,freedom,energy and time.