GE-208 adjustable pressure switch is a mechanical controller, the working principle and structure of this adjustable pressure switch is built-in piston connected with precision springs, when pressure changes, the corresponding changes in the spring scale, This adjustable pressure controller could trigger preset mechanical structure and signal switch. for the pressure switch, we have diaphragm and piston type. The preset pressure regulation is adjusted by the regulation dowel situated inside the instrument that can be intercepted with a 2mm hexagonal key. Gold-plated contacts will make sure the switch have a long lifetime.