Diameter: 21/2", 23/4", 3", 4"Case: plastic, steel caseWindow: grass, polycarbonate, acrylicConnection: bottom connectionRange: -1～17psi, 0～35kg/cm2 or according to customer order Scale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 2.5%-1.6%, 1%Inlet thread: 1/8", 1/4", 1/2", 3/8", NPT BSPT, BSP