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Empatica do a couple of devices that may do that. I think the wristband will measure heart rate accurately but it's megabucks
https://www.empatica.com/e4-wristband
All this chat about wearable tech... Do any of them track heartrate where it could give you the data beat by beat? I'm wondering if it would be useful to keep an eye on regularity or otherwise. So not just beats per minute. (Context: hereditary heart wonkiness, I've already had surgery once but it commonly comes back after a while, would be useful for me to be able to take data every so often and look over a 24h graph. Assume I know nothing about gadgets.)