Non-contact type led pressure switch were suitable in air, water pressure, oil pressure, steam system, refrigerant system.... Etc. The traditional contactor Gauges can esaily produce coal, sparking & unstable movements. Non-contact type led pressure switch demolish the traditional platinum contacts, it uses sensor elements to avoid the traditional platinum contacts Shortcomings. "safe" has enrich in experience & technology, and has the utmost quality, trust, safety & stability movements with this pressure switch.