Detailed Product Description stainless steel pressure gaugeDiameter: 4"Case: 304 stainless steelWindow: polycarbonateInternal: brass, stainless steelInlet thread: 1/8", 1/4", 3/8", 1/2", NPT ,BSPT, BSPConnection: back connectionRange: 0~10000psicale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Oil composing: glycerine, siliconeAccuracy: 2.5%, 1.6%, 1%