I never had any issues with the plastic Garmin strap, however it's annoyingly bulky.
I've got the Garmin HRM-Run strap, it's very comfortable and (so far!) immune to 240 bp spikes that generally indicate a lack of conductivity.
It also provides some clever additional metrics for runners - which may of course be pointless for your use case.
I could only find two Garmin straps, the one above and this one here. Is this the plastic job you are referring to?
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@Fignon started
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I never had any issues with the plastic Garmin strap, however it's annoyingly bulky.
I've got the Garmin HRM-Run strap, it's very comfortable and (so far!) immune to 240 bp spikes that generally indicate a lack of conductivity.
It also provides some clever additional metrics for runners - which may of course be pointless for your use case.