I do not know what, if anything, was ever implemented in the first one, but the second link talks about using a DC circuit (quoted below), so he is not informed about how to measure conductivity properly and I wouldn't use whatever he used (if, in fact, he ever made it).
"To do this digitally is a little more complex and is accomplished by passing a small DC current through the water sample."
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Randy Holmes-Farley
Current Tank Info: 120 mixed reef
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