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The Inspire HR heart rate was always with +/- 5 beats per minute (bpm) of the Fenix 5+.
That +/- 5 b
pm variation is GOOD. Very good.
Neither the Fenix nor the Inspire HR measure HR ‘non-stop’ so to speak. They read it a few times each minute. Maybe once a minute. That is to save battery life. So, there is no guarantee that they are both reading my wrist at the same time. What I did observe is that the Inspire HR always catches up to the Fenix within 30-seconds or so.
I have had (and worn) a Fenix 5(+) for nearly a year. I have checked its HR against multiple other devices: blood pressure cuffs, oximeters etc. I even got a nurse to check it last August. She was impressed. Said the Fenix 5 readings were within the range they consider ‘more than acceptable’.
I was impressed. $750 watch vs a band that costs $99.95. Just wanted to share that with you.