How do Apple watches, FitBits, etc. accurate? Are they truly precise?
In: Technology
Accurate regarding which measurement?
Measuring heart rate will be fairly accurate. Inferring calories burned from that measurement … not so much.
If it has GPS (or other GNSS) it will be accurate at measuring speed and distance, assuming you have a good view of the sky. (It will be less accurate when it comes to elevation, unless it has a barometric elevation sensor).
Detecting steps (or even other activities like weight lifting exercises) works by measuring acceleration and trying to match patterns. Measuring acceleration is highly accurate, but the pattern matching is difficult and can be fooled.
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