The pressure gauge switch is a device used to control the on-off state of the pressure gauge and the measured medium. It can open or cut off the pressure measurement circuit, facilitating the installation and disassembly of the pressure gauge. It can also protect the pressure gauge during equipment debugging and maintenance to prevent sudden pressure changes from damaging the instrument. At the same time, it has isolation and pressure relief functions to ensure measurement accuracy and operational safety. Its common materials include stainless steel, brass, engineering plastics and many other materials.