A hinge is a mechanical device used to connect two solids and allow relative rotation between them.

Hinges can be constructed from movable components or foldable materials.

Hinge Cycle Tester is used to determine the spring hinge of the frame has certain durability, can withstand a certain number of opening and closing activities, and maintain the original state, the purpose is to detect the change of the spring force of the spring hinge. The angle can be set to front angle -180--180 degrees, 

and Back angle -180 ---- 180 degrees.