Hello out there.
A few months ago I bought the HRM dual as a spare to my HRM pro.
The connection and the battery status seem to be fine, according to the app. Nonetheless since a few weeks into using the dual the heart rates measured by it are going through the roof.. e.g. measuring a rate rate of 150 while standing.
At first I thought it might be an error due to the fact that the pro was in my bag and had been rinsed after the previous workout (so still wet and measuring the damp in my bag). But after some trials over the last month the problem seems to be in the dual itself.
I cross measured the dual with my epix and the pro. And no matter the activity (cycling/swimming/walking/just standing) the hrm dual always gives away +40-50 beats. (E.g. epix and pro having ~75 while standing and dual ~120).
What can I do to fix the problem? I want to still use it as a spare on my way cycling home after a swim workout where the Pro has been used.
Thanks in advance.