The electrochemical Cell
Using all the above items, first make an electrochemical cell. Simply take two beakers and fill one with copper sulphate solution and the other with zinc sulphate solution.
The Salt Bridge
After filling the two beakers with different solutions, make salt bridge by dissolving some salt in water and putting it into a U shaped plastic tube. The tube, with ends inverted and covered in cotton pieces, will allow the flow of ions when each of its two ends are immersed in the beakers. Upon getting connected to the voltmeter, you will notice some deflection.
Replacing the Salt Bridge with Fingers
Using your fingers, make a 'V' and dip one finger in the beaker of copper sulfate solution and other finger in the beaker of zinc sulfate solution. You will be surprised to see deflection in the voltmeter, since your body just worked as a battery! This 'battery' will approximately have similar voltage as an average cell does.