A pressure gauge is a mechanical instrument used to measure and indicate the pressure of liquids or gases, commonly displayed in PSI (Pounds per Square Inch) and bar. It helps ensure safe and efficient operation by continuously monitoring system pressure and preventing over-pressure conditions. Pressure gauges are manufactured with brass or stainless-steel bodies, offering excellent durability and corrosion resistance. Typical pressure ranges include 0–60 PSI, 0–100 PSI, 0–160 PSI, and up to 0–300 PSI, depending on application requirements. These gauges are widely used in RO and water treatment plants, FRP vessels, filter housings, pumps, compressors, and industrial pipelines, ensuring reliable pressure monitoring with low maintenance and long service life.