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If you’ve ever done any type of long-term physical training, such as that needed to compete in and finish a marathon, or better yet, a triathlon, then you know how important it is to know how your body is reacting to the effort. I know this from personal experience from my days of long-distance running and other cardio-related exercise. I need to know where my pulse and oxygen levels are in order to see what I can and cannot do. This is why I’ll never give up my Nonin Onyx Fingertip Pulse Oximeter. It gives me the most accurate and reliable readings of any device of its kind.