No other HRV instrument is mentioned.
Also, I recommend looking into how the scientific method works.
Generally if you don’t have a standardized instrument, you must say what instrument you used.
If they said “HRV sensors can in general detect covid”, they would be making a claim not supported by their results.
You seem desperate to not have Apple’s name associated with this paper, but it would be unscientific not to name it.
Good scientists are careful not to make generalizations they can’t support with evidence or references.
No other HRV instrument is mentioned.
Also, I recommend looking into how the scientific method works.
Generally if you don’t have a standardized instrument, you must say what instrument you used.
If they said “HRV sensors can in general detect covid”, they would be making a claim not supported by their results.
You seem desperate to not have Apple’s name associated with this paper, but it would be unscientific not to name it.
Good scientists are careful not to make generalizations they can’t support with evidence or references.