All use original imported magnetic spring switches, with a contact life of up to 107 times; Its principle is simple, its performance is stable and reliable, its working life is long, and its application range is wide; Magnetic reed switches and wires are completely isolated from the measured medium and can be reliably used even under high temperature and high pressure; Multiple points and remote control can be easily and conveniently implemented as needed; Multiple materials: SUS, PP, PVDF, etc., with multiple installation methods to meet the different needs of various environments;