Yeah definetly pay attention to hydration levels and time of day. I would recommend waking up, drinking a glass or 2 of water to properly hydrate, and weight around this time. When they claim to be winthin 2% accurate, that is +/- 2%. So a reading of 12% means your actual bodyfat is probably between 10-14% (I'm skeptical if they are even this accurate). As stated though, if you try and control hyrdation level and time of day, they should show trends over time fairly good.
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