Help alevel chemWatch
Suggested method for measuring comparative electrode potentials of different metals
Clean a piece of copper using emery paper or fine grade sandpaper.
Connect the positive terminal of the voltmeter to the copper using a crocodile clip and one of the leads.
Cut a piece of filter paper to about the same area as the copper, moisten the filter paper with the sodium chloride solution and place on top of the copper.
Connect the second lead to the voltmeter and use the crocodile clip on the other end of the lead to grip a piece of another metal.
Hold the metal against the filter paper and note the voltage reading and sign.
Repeat steps (d) and (e) with different metals and record your results in a table.
Write the conventional representation for each of the cells that you have constructed
It seems you have sodium chloride as salt bridge.
You should have E cell values to work out the potential