This product is developed according to the actual needs of household factories and mines for pumping water, and controls the high-current relay according to the water level of the detection pool (water tower), So as to achieve control. It has small size, simple wiring, low power consumption, large switch capacity, strong anti-interference, and stable function high sexual characteristics. It can stably realize that when the pool (water tower) is short of water, the water pump is automatically started for pumping, and the pump is automatically stopped when it is full. : ELECTRICAL Model Number: 9V-12V Liquid Water Level Controller feature: water level sensor Power supply voltage: 9V-12V (both AC and DC) (Note: For safety reasons, please do not use a switching power supply) Control output: current 0~10A Control power: 0~1KW/220V ( can control 2KW) Board size: 60 x 50 x 25mm This product does not need to purchase a probe separately, and the probe can be replaced with a household wire. Note: The so-called probe is a wire with a plastic mesh shell to buckle the wire end, and the household wire can be directly sensed.Strip the wire end about 3 cm to a bare wire for direct sensing. In order to last longer, the place where the thread contacts the water,It is recommended to contact stainless steel to be better! Applications: Automation equipment manufacturers as the choice of supporting products Practical teaching for DIY enthusiasts or vocational school students color:Blue Material:plastic Package Contents: 2 x Water Level Controller Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.