Have you tried an optical one?
The Polar OH1+ that can go on the wrist or upper arm for example.
Or a watch like a Forerunner or Apple Watch?
Just tried my wife's Garmin one, which works with a bit of lag. Maybe I'll try and pick up a cheap OH1 if having something on my arm doesn't feel weird
@TooTallTim started
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Have you tried an optical one?
The Polar OH1+ that can go on the wrist or upper arm for example.
Or a watch like a Forerunner or Apple Watch?