As we all know that marked playing cards is widely used in different poker places by poker lovers around the world. But do you know the difference between barcode marked cards and back marked decks? As for back marked cards, you need to use our IR contact lenses, IR sunglasses or IR spy camera to read the luminous ink markings in the back of the cards. While reading barcode marked cards, you shall use poker camera to scan the barcode of marked cards and poker analyzer to deal with information received, and then get the final result through earpiece. Choosing suitable marked cards for yourself, it will not disappoint you.