I dont see why it couldn't work in a pinch...
Multimeter experiments with electricity and water
I think getting acurate readings would be next to impossible but you could still get a ball park figure...
Im not sure how you would go about converting the data recived from a multimeter into EC or PPM though...
Any math nerds in here who understand electric current...??
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When you measure EC you measure an electrical charge between two probes and the amount of resistance encountered
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btw, ohms is the resistance to flow of electricity that an electronic component has. usually used to test resistors in electronics, to see if they are operating correctly.
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In this case water and the solids in it are your "electronic component"... A multimeter tests the resistance of a known (internal component) against that of an unknown (external component)...
If you have ever made or seen a solar cell of oxidized copper and salt water you know that they can be an electrical component...