English English
I don't know if you have encountered it in the supermarket. The supermarket staff scans the barcode label of the item with PDA, changes the product price, and then prints the price and pastes it on the product to complete the product price change. The above price change job is simple and easy to do, but a lot has been done.
The barcode scanner uses the photoelectric principle to convert the barcode information into an input device that can be accepted by the computer. It is often used in libraries, hospitals, bookstores and supermarkets.
