Awesome oximeter for home use. I got this oximeter for my sibling. I'm not sure how to use it or how it measures oxygen content in the blood but from what I heard from my sibling who uses it, it works great. She said it gives reading within five o ten seconds and that it constantly measures the oxygen content while the meter is on the finger. #oximeterhttp://www.amazon.com/dp/B00ZZFQRFW