... diameter:1.5",2",2.5",3",4",6". Black Steel Case Dual Scale Dry Pressure Gauge 1. Diameter: 1 ½", 2 ... ", 2 ½ ",3",4",6";2.Case: black steel case;3.Window:glass, acrylic ... bar, Mpa, Kpa, kg/cm2,Hg Single or dual scale or according to customers order.9.Oil composing:glyceine ... oil;10.Accuracy: 2.5%,1.6%,1%. Black Steel Case Dual Scale Dry Pressure Gauge