Liquid level gauges are industrial meters that are used to determine the level of a liquid in a process tank. Liquid level gauge calibration is used to ensure proper readings are obtained when using level gauges. They have several advantages including durability for severe environments and also having the ability to withstand high temperatures and pressure. They are easy to read from a distance and can be used in addition to a switch or alarm in a system.  They can also be customized for extreme applications