Wika 230.20.100 Bourdon Tube Pressure Gauge has key features like Indicating pressure gauges for gauge, absolute, and differential pressure. For the optimal solution for the widest range of applications. There is a choice of measuring systems in the Bourdon tube, diaphragm element, and capsule element technologies. For the various requirements in industrial and process instrumentation. There are pressure elements in copper alloy, stainless steel, or special materials available.