Once I figured out how long I had to hold button… just home from open-heart surgery so I decided to keep an eye on my O2 level. Good product appears to work easily enough and appears accurate enough. It didn’t come with any instructions not that I expected much but when I first put it on my finger I didn’t know what to do so I held it down for several minutes-Not necessary! Just click it over the finger to engage it and then let it do its thing!
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