It has been several decades since I took a physics class, but I seem to remember that the voltage produced by two dissimilar metals in an electrolyte produced a known, constant voltage, independent of the electrolyte. The electrolyte did control internal resistance and current, but not voltage. So, if copper and zinc give a voltage of 1.100 can I cobble a temporary, low current, source accurate to thousandths of a volt? Do I remember the voltage correctly? Thanks
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