The working principle of Multi-point Float Level Switch is direct and simple. Set one point or multi-point of magnetic switch in sealed un-magnetic metal or industrial plastic tube. Fix the float with inner magnetic system in a certain place of magnetic switch in the pipe and let the float drift up and down; utilize the inner magnetic system in the float to trigger the open and close of magnetic switch to operate and control the liquid level. The working principle is simple and proved to apply to liquid measuring under various conditions. Normal open and close is the state with inserting liquid, multi-point float level switch is widely used in level control and alarm of all kinds of industry such as electronic, electric power, chemical, water treatment, water supply and drainage. multi-point float level switch is custom-made product