Features [Contact Sensitive]: The internal contacts are made of reed switches with high sensitivity. [Operating Range]: The action range of the two floats of the double float switch is 10mm. If the demand control range is large, a combination of two float switches can be used, so there is plenty of stroke to ensure the pump doesn't start too often. [Using Process]: The lower float switch activates the normal water drinking process, and the upper float switch stops working. The upper float switch activates the drain and the lower float switch deactivates it. [Wide Range of Uses]: The double float switch can be used to control the liquid level of water tanks, pools, sinks, fish tanks, etc. (drainage or water), or make the liquid level alarm switch up and down. [Precautions]: Floating point switches cannot directly control solenoid valves or high-power relays, AC contactors, etc. A small relay (eg HH54P) is required for the transition. Features: 1、The float switch cannot directly control solenoid valves or high-power relays, AC contactors, etc.A small relay(like HH54P) is needed for transition. 2、The double float switch can be used to control the liquid level of the water tank, pool, sink, fish tank, etc. (drain or water), or to make the upper and lower alarm switch of the liquid level. 3、The contacts inside are made of a reed switch with very high sensitivity. 4、The action range of the two floats of the double float switch is 10 mm. If the demand control range is large, two float switch combinations can be used, so that there is a large stroke to ensure that the pump does not start frequently. 5、Normal water intake process activated by the float switch below, and the float switch above stops working. The drain is activated by the float switch above and the lower float switch stops working. 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