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@Mu_Mu
If you're getting inconsistent readings then there are a few possible reasons. Heart rate straps do tend to fail eventually, and when they do they start registering bonkers heart rates such as 200+. Also, if the batteries in the sensor are dying, they can give silly readings too.
My best luck has been with the Polar soft straps. These are compatible with Garmin ANT+ clip-on sensors; the Polar sensors, however, aren't ANT+, so don't bother with those.