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Semi-auto Water detection

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To measure the purity of water you need to measure the conductivity (usually measured in micro-siemens) have a look at this article it may give you some ideas


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how about the circuit of purity sensor??
New to this forum but it appears Fig. 1 has the circuit. You just have to do the scaling. I'm sure there is a cheaper way but I would buy with a cheap digital meter and scale the voltage. You will need physical constants to create the scaling. (Note you can't do standards below 100 uS without being in a nitrogen blanket....and still they are difficult.
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