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Smartwatch advise
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I have the Galaxy Watch 4 and I like it. Here's a screenshot of the heart rate settings. On my current setting, it monitors continuously while exercising (including a long walk) and every 10mins while still.
It can also monitor blood oxygen continuously, but only during sleep (presumably to check for sleep apnea). While awake, you can take a manual blood oxygen measurement
It seems like "still" means whenever it's not tracking an exercise. But exercise includes walking more than a few minutes. It automatically records when I walk a lap around my office during break, so that's enough to trigger it