The Precision Instrument Corporation model 4504 and 6504 is a solid front process gauge with an aluminum front flange safety case with a black enamel finish. The aluminum black wrinkle enamel coated ring makes these gauges wells suited for panel board applications. The front screw lets users open the window and permits easy panel installation. There is a solid wall between the pressure sensing unit and the window, which provides greater safety for personnel monitoring the gauges. The bourdon tube with socket may be selected in brass, stainless steel or monel material. If choose, for example, stainless steel, then all the internal parts such as bourdon tube, socket , movement, screws, washers, etc. will be stainless steel. The stainless steel sensing element is suitable use in corrosive media and the pressure system is not subject to damage. Precision Instrument Corporation gauge models 4504 and 6504 are supplied as dry only and available dial sizes are 4 ½” or 6”. The 4 ½”dial is the standard gauge size. The 6”dial size is used where distance is a factor allowing viewing from a greater distance.