Yet another way around this “pairs” requirement is to add five narrow spaces to the last digit. Since the data security of Interleaved 2-of-5 is not quite as good as the popular alpha-numeric Code 39, adding a Check Sum or Digit would also work. If there is an odd number of digits to encode, a zero is often added to the beginning of the code. One of the drawbacks to using this particular code is that it will only work with an even number of numeric characters. ![]() It goes by a variety of names including I 2 of 5, I/L 2 of 5, 2 of 5, 2/5 Interleaved and some more unique one like ANSI/AIM ITF-5, ANSI/AIM I-25, Uniform Symbology Spec ITF, and USS ITF 2/5, ITF. ![]() Typically it is printed in low density to make it easy to scan or “read,” but it really is a high-density, numbers-only barcode developed in 1972 by David Allais, a leader in barcode design and the automatic identification industry. The Interleaved 2 of 5 barcode is often an overlooked and yet important symbology used in the shipping and warehouse industries.
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