Case type: stainless steel case (matte) and bayonet ring. Window: tempered glass or polycarbonate window Liquid filled pressure gaugeDial: 2.0”,2.5”,3.0”,4.0”,6.0”Case type: stainless steel case (matte) and roll ring.Window: tempered glass or polycarbonate windowFace and pointer: quality steel finishMovement: brassBourdon tube: brass or phosphor bronzeConnection: brass Thread:1/8”, 1/4”, 1/2”NPT, ...