Fitbit's Charge 3 Offers a New Take on an Old Tracker | WIRED
fitbit charge 3 inaccurate calories burned Off 72% - www.gmcanantnag.net
Fitbit, other heart-rate wristbands often inaccurate, study finds - Chicago Tribune
Fitbit publicly announced research results that "measured data" of Fitbit as "inaccurate", Fitbit argues that the result of the research is " inaccurate" - GIGAZINE
Fitbit and Samsung heart rate monitors may be inaccurate on dark skin | VentureBeat
Users reporting inaccurate heart rate on Fitbit Sense. Is there a fix?