Detailed Product Description Micro Vacuum GaugeCase: steel Window: glass or plasticInternal: brass, phosphor bronzInlet thread: 1/8", 1/4"NPT, BSPT, BSPConnection: bottom connectionRange: -160~600MbarScale: psi, bar, Kpa, kg/cm2, Hg single or dual scale or according to customers order.Accuracy: 2.5%