Start with a sheet of tin such as manufactured by KS metals. A single sheet can be used to make 4
sets of electrodes.
There are several suppliers that can easily be found on the net.
Cut the sheet along the length onto 4 pieces. The 4 pieces should then each be cut in half.
Solder some flexible wires to the tin, or 3mm. nuts, bolts and washers could be used.
Place fingers on the plates as shown:
Fold the tin around the finger tips for a comfortable fit.
The electrodes can have a plug connected and be wrapped in insulation tape.
Plug them into the C-Meter. This is the session :-)