... effect on bronze and brassType :KP-001 (Dry Steel Case Pressure Gauge)Dial size:1.5", 2", 2.5", 3, 3.5 ... ", 4", and 4.5", 6", 8", 10",Pressure range:-30" Hg-0-10,000PSISocket:Brass bottom and back connection ,side connectionConnection thread ... :NPT , BSP, BSPT and other special specificationBourdon tube:Brass or phosphor bronze tubeCase:chrome plated steel or Black painted ...