Detailed Product Description Oxygen Pressure GaugeDiameter: 2", 2-1/2"Case: steel Window: plastic Internal: brassInlet thread: 1/8", 1/4", NPT ,BSPT, BSPConnection: bottom connectionRange: 0~25kgScale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 3-2-3 %, 1.6% Use: used to measure the pressure of oxygen, is prohibited in contact with oil.