The best book I've found on GD&T is this:
http://www.amazon.com/gp/product/0872638650
I think this would normally be done with a Faro or Romer arm.
But True Position can be inspected with normal linear measurements. True position is just a different way of allowing tolerance. Measure the...
Pre-note: This is what I learned/remember from a Biomechanics class in college.
In this case, the NIOSH equation is really calculating what is safe as far as compressive forces on the lower back. Every lifting guide out there will tell you that you lower yourself to the item to be lifted...
