There are various types of invisible ink marked playing cards and poker scanning cameras in the market. Barcode marked cards and back marked playing cards are two kinds of them. The poker scanning camera is suitable for scanning barcode marked cards while the IR contact lenses or infrared sunglasses is fit for back marking playing cards.
For playing cards contact lenses, their diameters are divided into 4mm, 7mm or 9mm. And there are many colors for you to choose. Our perspective sunglasses are made of high-quality materials. For barcode poker card scanner, we fix poker camera lens inside daily items, so they can scan the barcode marked playing cards secretly.