Detailed Product Description Pressure GaugeDiameter: 1-1/2", 2", 2-1/2", 3", 4"Case: plasticWindow: acrylicInternal: brass, phosphor bronzeInlet thread: 1/8", 1/4", 3/8", 1/2", NPT, BSPT, BSPConnection: bottom connection, top connectionRange: 0~6000psiScale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 2.5%, 1.6% 1%