Interstate Pneumatics Pressure Gauges are extremely high quality pressure gauges. Tough construction with a 2-1/2" diameter white face. It is made tough to last and has a 2-1/2" diameter white face place for easy reading. Used for air, water, oil or other fluids, compatible with brass and bronze. Pressed steel case with shatterproof crystal and brass fitting. Mounting can be either bottom mount or center back mount. Gauges are available in pressure only, vacuum only, or compound both pressure and vacuum.