<p>There was a study done back in 07 that compared a DEXA scan (the most accurate way possible to measure body fat) and the Tanita scale, and they say there was better than a 96% level of agreement. Whatever that is, I got that out of my Racing Weight book.</p>
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<p>I've been using a Tanita for awhile, its good, but you can't do your body fat the first thing in the morning, it will be inaccurate. You really need to measure it after you have eaten and are well hydrated to get an accurate level. When I measure, I do it in the afternoon. Also wet your feet a bit before stepping on.</p>
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<p>EDIT: When I say after you have eaten, the book says a few hours after not right after. I'll do it around 3:30 - 4PM at least two hours after I've eaten lunch.</p>