Virtually all scale devices are capable of printing different barcode formats which result in different barcode length. For instance, barcode can be 12 digits long or 13 digits long. Often 13-digit barcodes will have first digit as 0 which is not read by barcode scanner so merchant would need to ignore that zero and take the set of 6 digits starting after the zero for product code.

Sometimes 13-digit barcode does not start with a zero, yet we still need to ignore the first digit and use digits position from 2 through 7 as digits for product code.