... 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; ... center back male connection;7.Range:0~10,000psi;8.Scale:psi,bar, Mpa, Kpa, kg/cm2,Hg Single or ... :glyceine, silicone oil;10.Accuracy: 2.5%,1.6%,1%. Black Steel Case Dual Scale Dry Pressure Gauge