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<p>[QUOTE=&quot;Just Carl, post: 100269, member: 4552&quot;]Not really necessary to buy one. You can make one. for example if your imaginative you could take a round pencil or any kind of rod. Balance a flat ice cream bar stick on it and when you find the center glue it in place. Move the flat stick back and forth until it balances. Make sure your doing this on a flat surface. Put one of the 82 pennies at the very end and a 1981 at the other very end. If not much difference, they are both the same material. If you&#039;ve done a good job of balancing, when you do get a cent made with Zinc there will be an very noticable drop on the 1981 side. Remeber to use a good condition 1981 cent. A worn one will weigh less you know. </p><p>If your disperate to be very accurate, try the Gilbert Chemistry web site or Edmund Scientific web site for elaborat scales.[/QUOTE]</p><p><br /></p>

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