How to measure resistance of resistance of gel electrolyte using multimeter
You would get a number but I'm not sure it would be a good one, due to possible potentials and polarization. 

I think you'd be better to use mains or low-audio frequency AC with a series resistor and measure the AC voltage across the electrode vs. the total voltage, then you can easily calculate the AC resistance of the electrode. 







simulate this circuit &ndash; Schematic created using CircuitLab

Rx = \$\frac{\text R_S}{(\frac{\text VM2}{\text VM1} -1)}\$