Liquid-level altitude pressure gauges determine the level of water or liquid in a tank or well. They are distinct from most other dial pressure gauges with their primary scale measuring “in. wc” (inches water column) or “ft. wc” (feet water column). They read the head pressure rather than gauging the pressure of flowing media in a system. All gauges are threaded with a back or bottom mounting connection. They are commonly used in tanks, standpipes, and other applications where water depth must be accurately gauged.