How do you fold the Ipad over when the dog is out?
Seriously I wouldn't use one to judge. The sun and rain were already mentioned. Even simpler, what do you do in AKC when the judge needs to take the bird from the handler? Your hands are covered in blood / water and feathers. You would have to wash your hands before writing down their score. I know as a judge I would be pissed if my co-judge was screwing around with the Ipad the whole day.