I tried to find an easy and reliable way of measuring conductivity of water samples but failed by looking on very complicated schematics. I don't want to use voltage divider as it makes more problems than usefull data. Please can you provide me with more information about this topic?
Conductivity is the reciprocal or resistivity.
Out old circuit board washer measured the resistivity of the water and stopped washing at 1 meg ohm. The new board washer stops washing when the wash water measures 1 microSiemen. Same exact measurement, just different values.
What is your problem with voltage dividers? Somewhere you have to have a range of voltages that an Arduino can measure.