What device is commonly used for scanning items at checkout?

The choice of a barcode scanner as the correct answer reflects its primary function in the checkout process. Barcode scanners are specifically designed to read the information encoded in barcodes, which are commonly found on retail products. When an item is scanned, the barcode scanner translates the visual pattern into digital data that the cash register or point-of-sale system can process. This not only speeds up the checkout procedure but also helps ensure accurate pricing and inventory management.

In contrast, while a cash register is essential for processing transactions, it does not inherently possess the capability to scan items. A credit card reader is used to process payment transactions but does not interact with product data in the same way as a barcode scanner. An electronic scale, which measures weight, is useful for items sold by weight but does not function in scanning or reading product information. Thus, the use of a barcode scanner is fundamental to efficient and accurate checkout experiences in retail settings.