Tanita BF% measurements

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Hi,

I have a Tanita scale at work that measures BF%. I know it's very inaccurate (it shows me values anywhere between 26% and 29% during the same day), but I've seen some comments in the forums from users that have the same type of scales, so I was wondering if any of you have found a way to get slightly more consistent results?
I thought that measuring myself in the morning would do the trick, but it didn't seem to help much (two consecutive mornings showed 26.7% and 29%). Does anyone have any suggestions?