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Heart Rate accuracy

I am still having heart rate readings that is inaccurate once in a while... 

The picture here shows my wife Fenix 5 on the left and Vivoactive 4 on the right.

A difference of 44, anyway to resolve this.  

  • I got really fed up with this so decided to complain to Garmin. However, before I did, I did a few runs with both the V4 and my old Forerunner 220 with both connected to my chest HRM. And the problem was … the chest strap.  Mea maxima culpa. Looked up advice. I now wet the sensors and my chest with a facecloth before I run, and everything is fine, apart from the strap not liking an old Helly Hansen (static, I presume).