... .Certification: ISO9001:2008 2. OEM available 3. Customizable different types of pressure gaugeDial size:1.5",2.0",2.5",3 ... .0",6.0"Socket:bottom connection and back connectionConnection thread:NPT , BSP, BSPT and other special specificationBourdon tube:brass or ... phosphor bronzeCase: ABSWindow:polycarbonate window Dial plate:Single and dual scale (psi, kpa, mpa, bar, kg/cm2) ...