Features 【Stainless Steel Material】: The double float switch is made of 304 stainless steel. Interior contacts are made of a super high sensitivity sheet switch. 【Action Range 10 mm】: This action range of the two floats of the liquid level sensor is 10 mm. If the demand control range is wide, two combinations of float switches can be used, so that there is a significant route to ensure that the pump does not start frequently. 【Easy to Use】: The normal water intake process is activated using the float switch below and the float switch from above stops working. The drain is activated using the upper float switch and the lower float switch stops working. 【Notice】: Stainless steel double ball float switch cannot directly control high -power solenoid valves or relays, CA contactors, etc. A small relay (such as HH54P) is needed for transition. 【Widely Used】: Our water level controller sensor switch can be used to control the water tank level, pool, sink, aquarium, etc. (drainage or water), or to activate the upper and lower liquid level alarm switch. Specification: Voltage:DC 0~110V Material:304 Stainless Steel Size(Floating Body Length):(Optional) 100mm / 3.94in  150mm / 5.91in 200mm / 7.87in 250mm / 9.84in Package List: 1 x Double Ball Float Switch Package List 1 x Double Ball Float Switch