Bar Code 2 of 5 Interleaved is a high density numeric bar code. It can encode only pairs of numbers (the bar code must have an even number of digits). Each bar code pattern encodes the odd digit in the pattern of bars and the even digit in the pattern of spaces between bars. To encode an odd number of digits you must pad the left most digit with a zero. Bar codes can be of variable length and don't normally use a checksum, although a modulo 10 check character is used in some special situations. Partial scans are possible since bar code 2 of 5 interleaved is not self checking. Fixed length data fields are often used to circumvent this problem.
 Encodes: Numeric Only
 Length: Variable, but must have an even number of digits
 Checksum: Optional
Both ITF14 and GTIN14 are created using Bar Code 2/5 Interleaved. This bar code is used on shipping containers and is based on the product UPC code. Note these bar code variations do require checksums.
Even though Bar Code 2/5 Interleaved does not require a checksum, it still needs a computer program to generate the string used in the bar code. Bar Code 2/5 Interleaved only encodes pairs of digits, from 00  99. Individual numbers, like 5 or 6 do not exist! Only the number pairs 05 or 05 exist.

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