Features: 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'for t cause malfunction due to moisture or conductivity of water for 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 for tank, it may actuate a pump, an indicator, an alarm, or other device. Use them with hydroponics, saltwater for tank, freshwater for tank, gardening, aquariums for power for head control, pet bowls, fish tanks, filtration, heating etc. 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. Package includes: 1x Water Level Sensor