No worries. It's the GP in me that knows the limitations of these machines and I'm not sure how much real world use a SpO2 monitor will be for the general public.
The other issue with CO poisoning is that people associate low oxygen levels with going blue (cyanosis). This is due to haemoglobin bound with CO2 being blue/purple in colour, hence blood in arteries being red and blue/purple in veins. Haemoglobin bound to CO is red and you don't see the blue colour around the lips/extremities despite low oxygen levels.
The reason I bought the device wasn't for the SpO2 monitor, I don't know anyone use regularly checks one yet alone has any measuring apparatus. There may be use for it, but far lower than the ECG (only lead 1 I think) functionality that's built in.
The last time I ever remember being near a pulse oximeter was when I was admitted to A&E, but even then an SpO2 reading wasn't absolutely necessary and needed just for the charts upon admission.
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