I wanted a pulse oximeter to monitor my blood oxygen levels.  I don’t like using eletcronic gadgets so I wanted one that was very simple to use and understand. I also needed on that was durable.  After some online research I decided on the go2 achieve oximeter by Nonin.  This oximeter is so easy to use and read it surprised me.  I know it is durable because I carry it in my purse and have accidentally dropped it several times.  It just keeps working and giving accurate readings each and every time I use it.  My doctor was so impressed by it he now tells all his patients to get the same one.