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Just use a Garmin watch with OHR? It's not like you're racing anymore and need the accuracy 😛
I did a little comparison a few years ago actually because aim a boring cunt.
https://strava.app.link/ggmCrB9d1Pb
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Why would I buy a (£150) Garmin watch when I could just use a cheap(er) strap?
I generally don't use HR outside, I only use it on the turbo, because I have power and I only care about x watts and not if my heart is going to explode producing x watts.
Although, thinking about it, I could use the HRM outside to get better estimates of training load on non-PM bikes. Better yet, I'll put a PM on the Surly :D
What's the best HRM these days? Sick of my old ones killing batteries.
Is there a rechargeable one yet? ie. strap that doesn't use CR2032 batteries?