I have the tantia and think it registeres too high most of the time. I also don't think it is accurate.

I weighed and measured body fat one night. Then I went and watched a video having only water. When I weighed and checked again on a lark, I found I had gone down a pound but up 2% body fat. I dobt watching a movie and drinking water really put on 2% body fat. It will also fluctuate depending onhow long it's been since I had dinner. I have noticed though since my body fat has gotten lower the flucuations aren't as wild.