This float switch is a device used to sense the level of liquid within a tank,the switch may activate a pump,an indicator,an alarm,or other device. This is a Mini stainless steel float swith,contains no mercury. This Mini float switch is a simple structure,easy installation liquid level controller. It does not have a complex circuit, not be ,as long as the material selection,liquid,pressure or temperture can be used in any environment., Manufacturer: CTRLZS