At the very least, they should make everybody purchase a refractometer. The chart is not definite enough and the strips aren't either. My A.D. is always there and would never cheat, but sometimes you are simply guessing. We could have 3 people look at it and nobody knows. I really believe we should either follow National guidelines or go to mat side weigh ins. On another note, if my kid comes in and pisses the bottom color on that chart, not only is he not hydrated but I am taking him straight to the emergency room.