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