If you wish to see what I am using,Google Pressure Trace and there is an explanation and you can download the program.Of course,the device costs.I am on my second one.The first directly wired to the laptop; the second,by Bluetooth.Been at it for about 7 years.I compared to pressures that I got from Armusa and they were the same.First posted 7 years ago and got the same skepticism.Will I not ever learn?