A float switch is a device used to detect the liquid inside a tank. The switch may actuate a pump, indicator, alarm or other device. Use them with hydroponics, salt water tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating, ponds, basement alarms, boats, air conditioning drain trays, pressure washers, carpet cleaning, reef aquarium, in relays, or whatever your project may be. Note: Because the current that the switch can be realized is much small (0.5A), you must use a relay or contactor when connected by a load, relays and contactors are not included here., Weight: 0.11464037624 pounds, Manufacturer: Rtxbvg