Features: 100% brand new and high quality There are 4 types, 1.5, 2, 4, 5 meters, 3 as 1 set. Anti-short circuit function, and won't cause malfunction due to moisture or conductivity of water tank or well wall. Adopts electrode rod to form an insulating sleeve with plastic, safe to use. A float switch is a device used to sense the level of liquid within a tank, it may actuate a pump, an indicator, an alarm, or other device. Use them with hydroponics, saltwater tank, freshwater tank, gardening, aquariums for power head control, pet bowls, fish tanks, filtration, heating etc. Package Includes: 1x Water Level Sensor Specifications: Material:ABS+Stainless Steel Size: 1.5, 2, 4, 5 Meters, 3.3/6.6/13/16 Foot note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.