I sent this to my 70 year old mother when she developed symptoms of Covid-19 in order to have some objective data if she ended up with a bad case. It arrived in less than 2 days-on the day she tested positive for the virus.I chose this one out of the others because it uses AAA batteries, not some hard to find or expensive battery. It was easy to read, accurate with just putting the finger in without much thought (increased accuracy if you pressed the pad of finger down and made the PI/pulse index go up). This little pulse ox provided me with so much information and helped guide her recovery.
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