Multi-position cylinders are mainly used in printing (tension control), semiconductors (spot welding machines, chip grinding), automation control, robots and other fields. When in use, one end of the piston rod is fixed, and the working voltage is connected to any input port of the cylinder. The piston rod is in one of multiple positions and can work stably. Because of its multiple stable working positions, the multi-position cylinder has a streamlined structure and high repeatability. Therefore, it is widely used in the weighing of controlled substances.