Happy with the purchase. It's easy to use, and I'm assuming accurate. The website said that it was clinically validated/ FDA approved, but I didn't see that listed in any of the paperwork that came with it. I believe it states that it is "guaranteed accurate." I'm not sure if that means that it the device is clinically validated/FDA approved. It would be helpful to clarify that on the manual that comes with the machine. Since it doesn't state that in the manual, I am giving the product four stars instead of five.