What circuit can be used to measure the Electrical Conductivity of filtered water

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martys2
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I am an amateur scientist interested in all fields of science.
What voltage potential is used to measure the EC of water to approximate TDS of filtered tap water?
 

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Asymptotic
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Do a search on "water conductivity measurement circuit".
There are several ways to go about it, although usually low voltage AC is used.
This PDF goes over the basics. https://www.instmc.org/Portals/0/Tech%20Talk%20%2810%29%20Liquid%20Conductivity%20Measurement.pdf
 
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