21. The final digit of a Universal Product Code is a check digit computed as follows: 22. The check digit highlights a large majority of errors in reading or recording the sequential number. 23. Some standards that use Codabar will define a check digit , but the algorithm is not universal. 24. The key is composed of a GS1 Company Prefix, Asset Type, Check Digit and optional serial number. 25. This does not change the check digit . 26. The VIPP programmer might even insert an MICR line for remittance processing, complete with a check digit . 27. In order to get the check digit one need to take the 10s complement of the number. 28. Moreover, the ten-digit ISBN check digit generally is not the same as the thirteen-digit ISBN check digit . 29. Note the different check digits in each. 30. The last digit is a check digit .
