Detailed Product Description Diameter: 2", 2-1/2"Case: plasticWindow: plastic Internal: brassInlet thread: 1/4", NPT ,BSPT, BSPConnection: bottom connectionRange: 0~315kg/psiScale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 2.5 %, 1.6%