Where will I find data surrounding the accuracy of fitbit devices. They must have gone through testing to measure accuracy. I'm particularly interested in the percentage accuracy for sleep tracking, heart rate tracking, and exercise tracking. I used to feel that these areas of tracking were fairly accurate. In the past four to five months the over-all accuracy of my device is hit or miss. One day might track just as expected, but the next two or three days show wild inaccuracies. There are days where every bit of recorded information is wrong, from sleep tracking to heart rate information.
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