Detailed Product Description Pressure Gauge Product Details:They can measure those gases or liquids which will neither exploded,norcrystallize,nor precipital,nor corrode with copper alloy.Case: 304 stainless steelWindow: polycarbonateInternal: stainless steel Inlet thread: 1/8", 1/4", 3/8", 1/2", NPT ,BSPT, BSPConnection: bottom connection, center back male connectioncale: psi, bar, Mpa, Kpa, kg/ ...