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I would like a comparison between this device and a DEXA scan regarding body fat measurement. EX: What is the approximate error margin?

They don’t go into details; but they claim it’s “as accurate as methods a doctor would use” and that they tested accuracy against DXA.

Interesting. I'll wait for some unbiased results before buying one, but it's promising!

DEXA scans are pretty cheap. A truck comes around to our gym a few times a year and I can get one for $40. (I'm at 12%)