What is a pulse oximeter and how can it help detect early stages of COVID-19?

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What is a pulse oximeter and how can it help detect early stages of COVID-19?
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M50 NanoSAT™ is very popular and branded pulse oximetry, keep it at home and be safe.

asimsingh
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M50 NanoSAT™ is very popular and USFDA approved branded pulse oximetry, keep it at home and be safe.

asimsingh