So I can actually feel my pulse in my upper arm presumably when the device is in it's measurement range so I've always presumed that it's sensing that with a pr

So I can actually feel my pulse in my upper arm presumably when the device is in it's measurement range so I've always presumed that it's sensing that with a pressure transducer and a simpleish algorithm, but I never thought to ask about how it actually works, and now I wonder if other people can feel them working.