Magnetometric level sensor.

I reduced parts quantity, and slightly remodelled floater and magnet. So now it's more like proper magnet with Hallbah array. I'm proposing that chip with sensor, and resistors needed for lowering voltage to 3,6V, will be enclosed in upper part of assembly. That allows , in case of failure, fast swapping of damage component. All lower assembly can be used again. Floater have thicker walls. Sensor can pic up change of levels from 5mm to 5m. It must be installed in geometric center of tank to reduce unwanted variations and false readings. Or it can be put in outside pipe that is connected to center of tank, and it will work with communicating vessels principle.