I like that the Charge HR and Surge have the ability to monitor heart rate via the wrist based optical monitor, but from what I have gathered, it sounds like all wrist based optical heart rate monitors have poor accuracy at high intensity workouts. It would be great if fitbit had a product that had a wrist based heart rate monitor, but would switch to using a chest strap heart rate monitor if one was detected. Any chance that the firmware/software on the Charge HR and/or Surge could be updated to use a bluetooth chest strap heart rate monitor?
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