Features: 100% brand new, high quality There are 4 types, 1.5, 2, 4, 5 meters, 3 in 1 set. With anti-short circuit function, it will not cause malfunction due to moisture or conductivity of the water tank or well wall. Adopt electrode rods with plastic to form an insulating sleeve, which is safe to use. A float switch is a device used to sense the liquid level in a water tank, which can activate a pump, indicator, alarm or other device. Use them with hydroponics, saltwater tanks, freshwater tanks, gardening, aquariums for powerhead control, pet bowls, fish tanks, filtration, heating, etc. Package Included: 1x Water Level Sensor Specifications: Material: ABS + Stainless Steel Size: 1.5, 2, 4, 5 meters, 3.3/6.6/13/16 footnote: Please allow 1-3 cm error due to manual measurement. Please make sure you do not mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual color of the item.