Review on Track Your Oxygen Levels And Heart Rate With IProven Fingertip Pulse Oximeter – Includes Battery, Case, And Lanyard In Blue by John Fuentes

It works, but you can practically make a sandwich while you wait for your reading. It's slow. I'd say it averages 6-7 seconds to read. And I've had readings vary by 3% just a second later. So it's not the most accurate thing, but works well enough that you could monitor your oxygen and pulse and notice anything you should bring to your doctor's attention. For example, if you get three readings in a row of 92%, or your resting heart rate is always over 100, mention that to your doctor. The blue color is nice, and you can clearly see the red LEDs from across the room, so no issues there. It's not one that you'll find being used in a hospital, but it's adequate for occasional home use.