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Aria and Aria 2 estimate your body fat percentage using body impedance. Because several
different methods can determine body fat percentage and none are 100% accurate, the scale's
body fat reading may not perfectly match other scales or manual methods such as calipers.
Why does my weight differ between Fitbit
Aria and Aria 2?
Aria 2 has been redesigned to provide more accurate measurements than Aria. For this reason,
you may notice different readings between the scales.
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