With float-based measuring systems for level monitoring, a distinction is made between float switches, level sensors and bypass level indicators. Float switches are used for the point-based limit level detection of one or several levels. Because they are simple, universally applicable and exceptionally reliable, float switches have a very wide range of applications. Depending on accuracy requirements, level sensors are available with reed chains or magnetostrictive measuring systems. Bypass level indicators are mounted on the side of the tank and are often combined with a magnetic display for a visual level indication.