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A comment on “You don't have a voltmeter. Do you have a potato?”. Parent comment

Re:“You don't have a voltmeter. Do you have a potato?” by djmips on Friday November 25, 2022 @09:43AM (#33742788)
Which seems to show that you use the pencil graphite as an electrode and spark it to ground. The 'fatness' of the spark determines the polarity.
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