I don't watch Pawn Stars, but there are commercially available small portable microscopes that plug into your computer with the magnified photo and video viewable live on your computer screen. If you wish, you can take a digital snapshot or record the video. It's essentially a little pointable webcam, but designed for super closeups rather than selfies or videos of your dog. I don't have an ipad, but use one on my apple laptop. Mine goes up to 200x power.
I'm not an autograph person, but use mine to examine the printing ink on prints, documents, trading cards, art and such. Would work fine with pen ink and, in fact, I've viewed pen writing with it, as some of the printed items I examine have handwriting on them.
If you want examination of the power and detail, below is a picture of my jeans pants leg as I was sitting at my computer:
