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<p>[QUOTE=&quot;desertgem, post: 1921927, member: 15199&quot;]Actually, Doug your scales might be exactly correct, as the nickels have a specified weight of&nbsp; 5 grams&nbsp; +/- 0.13grams, so for gov. specs, any nickel from 4.87 to 5.13 grams may have come from the mint like that. Because the last digit of a digital scale reading is a rounded result, so best is to get a scale that reads 1 more digit than you will need. It will still be rounded, but you can ignore it as accurate. US coins generally have tolerances&nbsp; with two decimal digits, so one with .001 readout should suffice if you are seeking to identify off-metal coins, counterfeit, etc.</p><p><br /></p><p>A calibration weight is important to use to correct the electronic sensor in the scale occasionally, especially if you drop it. You can make one with a stack of nickles if you weigh them on another scale that has been recently calibrated.</p><p><br /></p><p>I would think that for ancients , the tolerances might be higher, but I wouldn&#039;t know who might have original weights <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> Modern coins often give a nominal weight without the tolerances, so everyone thinks they have an error.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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