300 series gauge line is a high quality line of stainless steel gauges. Hermetically sealing the gauge prevents dust, dirt or other contaminates from entering the case of the gauge and attacking the movement or internals of the gauge. Keeping out such contaminates prolongs the life of the gauge. This gauge has been specifically designed with original equipment manufacturers in mind. It is typically used in chemical processing or food processing applications as well as any commercial or industrial application where stainless steel components are required.