“Does Fitbit Charge 5 use the original PurePulse technology or the newer PurePulse 2.0 version for heart rate? I have heard both yes and no an equal number of times in Fitbits forum. A Google Search was the same issue...some links said newer & some said no”
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From what i read unless your getting most of the fitbits are the newer hert rate. Most companies are getting fda ratings now and bedore tge didnt have to.
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