Detailed Product Description Tire pressure gaugeDiameter: 2", 2-1/2"Case: plastic Window: acrylicInternal: brass, phosphor bronzeInlet thread: brassConnection: bottom connectionRange: 0~200psiScale: psi, bar, Mpa, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 2.5%, 1.6%