I got some calipers, the ones with the springs in them, and I think they're pretty good, comes with a book that tells you 4 places to measure and you take the sum of the measurements and put your age into a formula and gives you a reading and it was only 1% away from my underwater weighing reading(the most accurate method available) The worst way to get bodyfat measurements are from a store bought scale with the electroresistance measuremants, the only resistance measurements you can trust are ones that are calibrated regularly(very rarely in the gym)