Always know how much water is in your tank with the Tank Gauge. The Tank Gauge features a clear and simple dial with "Empty" and "Full" indicators enabling you to quickly determine your current water level, making it an essential tool for effective water management. The Tank Gauge is suitable for all vented aboveground and below-ground tanks up to 8 feet in height. Installation of the Tank Gauge is straightforward, requiring only a single hole in the tank. Once installed, calibrating the gauge to your tank height is as simple as adjusting the hands on the dial.