Detailed Product Description Low Pressure GaugeDiameter: 2-1/2", 3", 4"Case: steel chrome plating, stainless steelWindow: glass or plasticInternal: brass, phosphor bronze, 316L stainless steelInlet thread: 1/8", 1/4", 3/8", 1/2", NPT, BSPT, BSPConnection: bottom connectionRange: -160~600MbarScale: psi, bar, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 2.5%