What a wonderful Fingertip Plus Oximeter !.
I like that it gives correct pulse oximeter.
It comes with a cast as well a string to put around your neck with batteries to put inside the oximeter.
I recommend this because you can bring it anywhere with you .
If there's an emergency this comes in handy because you can check there oxygen and their pulse level to see what it is.
It is great to educate yourself on how to use this correctly and what it means.