Hmmm

Did the face one first, heart rate (bpm) was 44, pretty good!
Did the finger over the lens, heart rate (bpm) 179 thats more than when Im on the spinner at the gym after I hour at over 90 rpm sustained for the entire hour. Tests were done within I minute of each other.
Before I rate using stars, Ill try it at the gym. Oh well , wont let me submit without at least a star, so thats what itll get for now!

Pooljac about Heart Rate Monitor: measure and track your pulse rate