There are various methods to measure the liquid level and other liquid characteristics. The technique of measurement relies on the type of tank gauging system, the liquid type and how the tank gauging system is used.
Modern tank measuring devices digitize tank measurements and communicate tank information digitally to a control room where liquid volume and mass information are distributed to inventory data consumers.
Usually storage tanks come in four basic designs: Cylindrical fixed roof tanks, cylindrical floating roof tanks and either spherical or horizontal cylinder design pressurized tanks. For all these kinds of tanks, tank gauging system are accessible.