The final UPC code would then be 11 digits plus the check digit (in this case, 2). When a UPC code is scanned at a point of sale (POS) system, the scanner reads the code and calculates the check digit using the same formula. If the check digit does not match the one in the cod...
It isn't. The last digit of all UPC, ISBN and EAN barcodes is called a check digit. Barcode Producer automatically calculates this for you so that an incorrect check digit can’t be used (thereby rendering an invalid barcode). You can also verify the correct check digit usingGS1’s chec...