https://www.markedcardsshop.com https://www.markedcardsshop.com This appears to be the / a source for the devices in question. It's worth reading over the tec

https://www.markedcardsshop.com https://www.markedcardsshop.com This appears to be the / a source for the devices in question. It's worth reading over the technical details of how it all works. It's both terrifying and impressive. Cards can be identified using a barcode encoded on their thin edge from meters away.