A scanner is configured to verify barcodes as described below. The scanner has a processor and memories for reading a barcode, capturing images of the product having the barcode, and generating notifications based on attributes of the barcode attached to the product. The processor measures barcode attributes specified by international barcode standards for each barcode extracted from the product images. A grade is then assigned to each extracted barcode based on the barcode attributes and the corresponding measurements. If necessary, notifications are generated based on the assigned grade and are then transmitted to the retailer to correct the deficiencies with the barcode or the product.