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

[ZipZapOuch]

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.

 

[ZipZapOuch]

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).

Or even "deionized" water.

 

[rjenkinsgb]

I'll stick with the REAL English spelling, thanks,