... design. 3.Easy operation. 4.Case with rolling Product Name:Oxygen Pressure gaugeOxygen Pressure GaugeDiameter: 2", 2-1/2"Case: steel ... /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% Oxygen pressure gauge