... 2",2.5",3",4",6". Black Steel Case Dual Scale Dry Pressure Gauge 1. Diameter: 1 ½", 2", 2 ... connection, center back male connection;7.Range:0~10,000psi;8.Scale:psi,bar, Mpa, Kpa, kg/cm2,Hg ... Single or dual scale or according to customers order.9.Oil composing:glyceine, silicone oil;10.Accuracy: 2.5 ... %,1.6%,1%. Black Steel Case Dual Scale Dry Pressure Gauge