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40 pennies or 20 nickels.

*Post-1982 pennies. Before 1982 they were all copper, after they were mainly zinc.

I just calibrated my scale with 40 post-1982 pennies and now each penny weighs between 2.48 and 2.54 grams. So, not quite accurate, since apparently they started using less and less copper through the years, gradually changing the weight of a penny.

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13y ago

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