When I got concerned about my dad’s health, I wanted to get some equipment to help me monitor his condition.  The Nonin Onyx was one of those pieces of equipment I wanted.  I was able to locate it online at many online stores.  With easy to read digital output and easy to follow instructions, it was an easy choice to make.  Because of this, we are able to care for dad at home most of the time where he is most happy.  We know when we have to take him in to see the doctor if his pulse ox gets too low.