!!! Overview
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!! [{$pagename}] [GS1] [Global Trade Item Number] [1]
is an additional digit, used to verify that a barcode has been scanned correctly. It is computed modulo 10, where the weights in the checksum calculation alternate 3 and 1. In particular, since the weights are relatively prime to 10, the EAN-13 system will detect all single digit errors. It also recognizes 90% of transposition errors (all cases, where the difference between adjacent digits is not 5).

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [International_Article_Number|Wikipedia:International_Article_Number|target='_blank'] - based on information obtained 2017-10-28-