Bests & Worsts Reviews from Amazon

I tried 1 other finger one (DOA - not this vendor) and a wrist watch one (completely inaccurate). I spend a LONG time looking at reviews and stuff before I tried this one. It's right on and super easy to use. It works! I use on ring finger for quickest results. It obviously it not to be used while running. I use it after workout, better reps and to check my resting heart rate.