... ", 2", 2.5", 3, 3.5", 4", and 4.5", 6", 8", 10",Pressure range:-30" ... 10,000PSISocket:Brass bottom and back connection ,side connectionConnection thread:NPT , BSP, BSPT and other special specificationBourdon tube ... chrome plated steelWindow (lens):Glass, acrylic, and polycarbonate lens availableDial plate:Single and dual scale (psi, kpa, mpa, ... GENERAL PRESSURE GAUGE with carton steel and brass material