Physicians have been using them for some time now. Here you are.. http://www.amazon.com/Popular-Blood-Pressure-Cuffs-Healthy/lm/R3SQXEDH9K4NHM
Oh no...no..I am sorry I was confused then. I have heard of a tool that monitors your breathing while you are trading and it teaches you how to calm down and mantain a certain level. I guess I failed to read the previous post. Im sorry. Have you heard of what I am talking about? Thanks for your prompt reply anyway.