☀💦【LARGE STROKE DOUBLE FLOAT SWITCH】The action range of the two floats of the water level sensor is 10mm.If the demand control range is large, two float switches can be used in combination, so that there is a large travel to ensure that the pump does not start frequently. ☀💦【SENSITIVE DETECTION】The contacts of this liquid level switch inside are made of a reed switch with very high sensitivity.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 float switch below stops working. ☀💦【WIDE APPLICATION】The aquarium dual float switch can not only be used to control the liquid level of the aquarium, but also for water tank, swimming pool, sink, aquarium,etc.(drain or water), or to make the upper and lower liquid level alarm switch. ☀💦【PURCHASE NOTES】This liquid level sensor cannot directly control solenoid valves or high-power relays, AC contactors, etc.A small relay (like hh54p) is needed for the transition to ensure its normal operation and safety, it is very easy to use. Size(Body Floating Length):(Optional) 100mm/3.94in 150mm/5.91in 200mm/7.87in 250mm/9.84in