The Universal Product Code is the symbology with which most people are familiar since it appears on items in supermarkets and retail stores. UPC is a fixed length, numeric, continuous symbology. These digits are split by center bars into left and right data fields. The remaining character is a required check character used to check the accuracy of the bar code read. Introduced in 1981, Code 128 is gaining popularity and replacing Interleaved 2 of 5 and Code 39 in many warehouse and distribution applications.
Every character is composed of two digits and begins with a bar and ends with a space.
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