... Description oil pressure gaugeDiameter: 1-1/2", 2", 2-1/2", 3", 4", 6"Case: 304 stainless steelWindow: polycarbonateInternal: stainless steel Inlet thread: 1/8", 1/4", 3/8", 1 ... , Hg single or dual scale or according to customers order.Oil composing: glycerine, siliconeAccuracy: 2.5 ...