Bests & Worsts Reviews from Amazon

This device is much more accurate than any other heart rate monitor on the market, to even include blood pressure cuffs and pulse ox monitors at the hospital. There are many other types of monitors, they typically take your pulse rate at your wrist or fingertips but this spot is nowhere as accurate as this device on your forearm. I don't know why or how, but it just is. Also, if you do not have a normal sinus rhythm then those other devices quicky become confused and give erroneous readings. I had to go to the cardiologist for a stress test with the O2 mask and 12 lead EKG. I asked the cardiologist and tech if I could wear this device and compare it to the pulse rate displayed by the ekg and other monitors. They were ok with it and very interested in how it would do. After 20 minutes it crushed this little test. It was spot on for my resting heart rate, max heart rate and only slightly lagged the EKG by a second or two. This is phenomenal and it is hard to relay how wonderful this is, as every other device I've used (to include fitbit and chest heart rate monitors) were unable to accurately measure my heartrate as it changed under different levels of cardiac stress. They did ok for my resting heart rate but could not give accurate and/or instantaneous readings of my actual heart rate while working out. The doctor was blown away, he stated that he had never seen a device on the market as accurate as the scosche, let alone a heart rate monitor that could accurately give instantaneous readings of people with arrhythmia's. I've been an athlete my entire life. I did crew and soccer in high school and college. I've done marathons, triathlons, 100 mile rides...etc. I've tried countless heartrate monitors, polar, suunto, Fitbit...etc and none could come close to me measuring my carotid pulse for 6 sec and multiplying by 10. (Or an entire minute) This device delivers, it's simple and accurate. It doesn't slide down like chest straps do when you do long runs, I don't have to apply any gel to leads. It just works and I know it's as accurate as a 12 lead EKG. It may not tell me that I have a t-wave abnormality or preventricular contraction but it continuously and accurately gives my pulse rate. The battery lasts about 5-7 one-hour workouts. After that, the pulse rate isn't as accurate. I know what a pulse rate of 140 feels like for me, so when my watch or phone displays a pulse rate of 90, I check my pulse and realize the device is not relaying correct data and I need to charge it. Once it's charged, it's good to go again. It syncs to most devices quickly as it uses standard ANT+ and Bluetooth. Bottom line-this works so well it surprised my cardiologist and I trust it with my life. I actually wouldn't workout without it anymore.