Kari-Finn Oy is a Finnish family-owned company. It is a subsidiary of KFR Hollola Oy. The main product of the company is multilevel float switch, a cable-suspended control device which tilts as the liquid level rises or falls. Kari float switch makes it possible to have multiple functions with just one switch. Besides the main product, Kari-Finn Oy produces also many other electrical devices, such as electrode switches based on conductivity of liquid, silo switches made for surface level control for loose storage items, temperature based thermal fuses, watertight pump cable connectors and alarm and control units for pumping stations.