brand new and high quality Features: Made of high quality material, solid, durable, good conductivity and good performance, long service life. Adopts electrode rod to form an insulating sleeve with plastic, safe to use. It features anti-short circuit function, and won'for t cause malfunction due to moisture or conductivity of water for tank or well wall. The conductivity of water in boiler is used, when the water level in boiler The change occurs, because the electrode rods of different lengths and different water levels contact and separate, the electrical circuit is closed or opened, and the signal of the reaction water level change is transmitted outward, and then the signal can be further processed according to the signal, the electrode type water level The sensor uses the conductivity of water as the working principle, the sensing quality is stable, it is not easy to generate false signals, and the signal of the position in the water can be reliably received and transmitted. Suitable for solar energy, energy, hot water for tank and so on. Specification: Material: Stainless Steel Temperature: 105/221 Length: Red: 1.5m; White: 2.5m; Blue: 3.5m Color: Red, White, Blue Quantity: 1 Pack Note: No retail package. Please allow 0-1cm 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. Thank you! Package includes: 3 x Water Lever Sensor Probe