Wine has a resistance of 74K ohms to 84K ohms.

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Leave the "meter" in the wine for a half hour and watch the zinc electrode dissolve and increase the conductivity increase and the taste improve - soon it will taste like whine.
 
rjenkinsgb said:
It's not acids specifically - it's any ions in the liquid that improve conductivity.

Try the meter probes in water with salt, for example!

(That's why pure "deionised" water does not conduct).
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Or even "deionized" water.
 
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