... range scale dry pressure gauge bottom brass connection diameter:1.5",2",2.5",3",4",6". Black Steel Case Dual Scale ... Connection: bottom 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, ... 2.5%,1.6%,1%. Black Steel Case Dual Scale Dry Pressure Gauge