Optical HR limitations
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What is the lowest heart rate this device can measure? Oura ring for example tells outright that due to technical limitations, it can’t measure lower than 33. Often I get gaps on its data and lowest value being 34, sometimes it manages to catch 33. Suunto 9 Baro seems to consistently measure a beat or two higher. I recall once it measuring a value of 32 but generally it shows my RHR being 35 or 36.
For comparison, I have used Polar OH1 some nights. It results in a realistic looking graph with multiples instances of 30, 31 and 33 but I have no idea if that is reliable data.
And what about newer hardware, are they any different in this regard?