This watch not only lets you count BPM by pressing the button according to the beat, it can count BPM simply by tilting it forward and back (this is useful when you attach the watch on a rowing oar / paddle). It may not be as flashy, but it has been around for quite a while.
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I've been wearing a watch with BPM function on it for more than a year.
http://www.nkhome.com/rowing/cadencet1.html
This watch not only lets you count BPM by pressing the button according to the beat, it can count BPM simply by tilting it forward and back (this is useful when you attach the watch on a rowing oar / paddle). It may not be as flashy, but it has been around for quite a while.