Freon ManometerSize:2.5" or 3.5"Pressure Range:From 30niHg to 550psiSocket:BrassmaterialThread:BSP,NPT BSPT,PT,ZG,and other special specificationBourdom Tube:Phosphor bronze or stainless steel materialCase:Plasitic, black steel, chrome platedBezel:No bezelWindow:Screw-on PC LensDial plate:Single,dual or three scales(Bar,Psi, Kg/cm2,Kpa,Mpa)Accuracy:3-2-3%, 2.5%, 1.6%,Movement:Steel or brassPointer:AluminiumU-Clamp:Chrome plated or St St materialFlange:304 St St materialRestrictor:Brass or St St materialOver Pressure:130%