... 1. Diameter: 1 ½", 2", 2 ½ ",3",4",6";2.Case: black steel case;3.Window:glass, acrylic, polycarbonate;4.Internal: brass, stainless steel ... ,000psi;8.Scale:psi,bar, Mpa, Kpa, kg/cm2,Hg Single or dual scale or according to customers order.9.Oil ... :glyceine, silicone oil;10.Accuracy: 2.5%,1.6%,1%. Black Steel Case Dual Scale Dry Pressure Gauge