How Do Barcode Represents The Number 0 - 9?
Each digit in the product number is given the same horizontal space of exactly 7 units. The 7 units are colored with a different pattern of black and white stripes.
For example, number one is represented by 2 white stripes, 2 black stripes, 2 white stripes and 1 black stripe. Number two is represented by 2 white stripes, 1 black stripe, 2 white stripes and 2 black stripes.
How Barcode Scanners Work
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Barcode, Technology