Check Digit
Because Codabar is self-checking, most standards do not define a check digit.
Some standards that use Codabar will define a check digit, but the algorithm is not universal. For purely numerical data, such as the library barcode pictured above, the Luhn algorithm is popular.
When all 16 symbols are possible, a simple modulo-16 checksum is used. The values 10 through 19 are assigned to the symbols –$:/+.ABCD, respectively.
Read more about this topic: Codabar
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