Holiday blow out, which scales do I believe?

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On holiday this year, using cheapo IKEA I weighed 86 Kilos having left UK showing only 80 Kilos on top-of-the-range Secca. If I believe the IKEA (which I tend to do) I have to lose at least 10 kilos. Hey 6 kilos difference is too much (both set correctly), is this how Secca get popular, everyone (most folks anyway) want to lose some weight- this is the easiest option.

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