I ordered the TDS controller with water conductivity probe now I want to work on Arduino and interface that probe with my Mega in order to get the value of water conductivity in LCD instead of TDS controller. There is 4 wire in probe 2 for conductivity and 2 for temperature I try to find the code on the internet but didn't find yet. Now i am here looking for help.
Not all conductivity probes are the same. The answer you want will depend on exactly what it was that you bought. I don't understand why you would leave that out.