Know-Book by Himitsu

The effect is as follows. You hand your spectator a deck of cards, which they can freely shuffle using any method they like. They then select any card at random from the deck and place it to one side. You then take what looks like an innocent paper pad and write down the name of a playing card. You tear off the prediction and place it next to the spectator's card. When they turn their card over, it's a 100% match!

Know-Book is an ingenious gimmicked notebook that allows you to see what others do not. By looking at the back of a playing card through the notebook's cover, the value of the card is clearly seen. Think of it like x-ray vision for cards!

Spectator can use ANY shuffle
No forcing required
100% correct, every time
You never touch the deck