5. How we can understand that an electrode picks up low or high level of moisture:
Take a bunch of 5 to 6 pieces of electrodes. Hold the bunch horizontally on the palms and rattle (shake) the bunch lightly near the ear. Dry electrodes (say fresh from Vacuum Pack or just re-dried) will give a strong metallic type of sound. If the electrodes pick up low moisture level, the bunch will emit not so strong sound. Highly moist electrodes will emit feeble or dull sound.