[Emoore]

I've heard before that a truly professional trainer should know how to use calipers. I've also heard many times that it takes a lot of practice and education to learn to use them correctly. What nobody's been able to tell me is where you get this education. I've been to large commercial gyms where not a single trainer has the slightest idea how to use the things. Is there a class you can take? A guru to track down? How did you learn it?
Thanks!