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Message:: [QUOTE="-jeffB, post: 25484447, member: 27832"]The chart is surely guilty of displaying excessive significant figures, and the original weights and tolerances were most likely in grains or something of the like. It doesn't take much technology to build a balance that's sensitive to differences of a few milligrams. Once you have that: Find or make two coins that match in weight to the limit of your balance's sensitivity. Take one and file it down until it's as light as you're willing to accept. That's your lower limit. Take another and add metal to it until it's as heavy as you're willing to let go. That's your upper limit. Put the coin under test onto one side of your scale, and the light one on the other. If the light one goes down, your coin's too light. Now, put the heavy one on the other. If the heavy one goes up, your coin's too heavy. Neither happened? Your coin is within tolerance. Right?[/QUOTE]