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This has been very reliable for me.
http://www.dx.com/p/ant-wireless-heart-rate-monitor-strap-for-smart-phones-computer-black-256722
Garmin run HRM belt.
I was on the turbo using trainerroad a while back, and at the end of an interval I ramped my HR up to 95%max. But then as I started recovery, my HR figure just continued to Climb. To a few BPM above max. After that I felt it continually displayed 5 - 10 bpm too high.
I had hoped it was just a Ant+ stick /trainerroad issue. But then on my NeXT ride my Garmin wouldnt find it.
Despite having changed the battery only a couple months previously. I put a New one in. Which fixed it. Must have been a shite battery I figured.
But now the same thing is happening again. Last night it spent a period showing 10bpm too much, and then 10 bpm too little.
The New battery is from the same cheapo EBay batch as the last. So its possible its that. But I do suspect the HRM now.
Anyone else had this issue?
Best Budget ant+ HRM?