Water Level Sensor Flow Inductance Water Pump Controller Float Switch Aquarium Fish Tank Swimming Pool HydroponicsOOTDTs: 100% Brand New and High Quality 4 kinds are available, 1.5, 2, 4, 5 meters, 3 as 1 set. Anti-short circuit function, and will not cause failure due to moisture or conductivity of the water tank or well wall. It adopts electrode rod to form a plastic insulation sleeve, safe to use. A float switch is a device used to detect the liquid level in the tank, it can start a pump, indicator, alarm or other device. Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums to control power head, pet bowls, aquariums, filtration, heating, etc. Specification: Material: ABS + Stainless Steel Size: 1.5, 2, 4, 5 meters, 3.3/6.6/13/16 feet Package Included: 1x Water Level SensorNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.