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A study of few useless water level indicators



This type circuits come as science models , even engineering  students make to show . While in demo it looks fine  , the circuit is as follows ....


lets list the problems

- The 9v cell is not solution it will drain in 20days
-the probes will be damaged by water corrosion
-the wires may catch noise and give very wring reading

- very costly 6wire wiring for high tanks

Our solution
  -2 wire sensing
 -touch to read , saves battery for 2 years
 -probes made of graphite
 -very low cost like 40Rs 

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