Bests & Worsts Reviews from Amazon

This little device works just as well al the ones in the doctors office. I just inserted the provided batteries and got an instant pulse and oxygen reading. I later took to with me to the gym and used it on the treadmill. Walking at a fast pace I was able to get consistent readings. The pulse matched what the treadmill had and oxygen was consistent. I will check it at the doctors office next time I go. I believe it will be perfect. I recommend this to anyone needing this type of device either for health issues or sports training. I would definitely buy again.