> I can put the cuff on my arm and sit at my desk for 20 minutes to be nicely rested and calm, and then take 5 different measurements with a few minutes between each one. ...
Doesn't it take more than a few minutes for one's circulation to return to normal after a BP measurement?
Eh, not really. We measure blood pressure every five minutes (or less) for patients under anesthesia. They're pretty reliable. Of course, they're unconscious, so they can't really anticipate the discomfort of the cuff going up on their arm and react to that, and frankly given that they are being carved open the pain of a cuff is pretty minimal by comparison.
Doesn't it take more than a few minutes for one's circulation to return to normal after a BP measurement?