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Check the contact points. A hair or a speck of dust can do that and cleaning will fix it. More seriously, the scale could be chipped. Be nice if you could check it against another scale or a check weight, but I'd settle for checking it against a volumetric powder charge. The Lee dippers generally throw a couple of tenths light so I would not be concerned about a slightly low reading, but I would worry a lot about a high reading. I'd weigh the same charge at least a dozen times checking repeatability. Plus or minus a tenth is to be expected, but more than that is too much.
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