Detailed Product Description All stainless steel pressure gaugeDiameter: 1-1/2", 2", 2-1/2", 3", 4", 6"Case: 304 stainless steelWindow: polycarbonateInternal: stainless steelInlet ... according to customers order.Oil composing: glycerine, siliconeAccuracy: 2.5%, 1.6%, 1% Exported to England, America and other Western countries, attained ISO9001 ...