Dial size: 1.5â , 2.0â , 2.5â , 3.0â , 4.0â Case type: polished 304 stainless steel case and bezel Window: flat glass or plastic window Face and pointer: aluminum finish Movement: 316 stainless steel Bourdon tube: 316 stainless steel Connection: Brass Thread: 1/ 8â , 1/ 4â , 3/ 8â , 1/ 2â NPT, BSP, BSPT or according to the customerâ s request Accuracy: ASME Grade A Pressure range: -30â -0-6000psi