A UPC-E is a smaller seven digit UPC symbology for number system 0. For UPC-E barcodes, normally 6 digits are specified and the barcode calculates the seventh check digit.
Valid symbols: |
0123456789 |
Length: |
fixed, 8 characters |
Check digit: |
one, modulo-10 algorithm |
Before the Middle guard bars, a binary 1 is indicated by a bar, while a 0 is indicated by a space. After the Middle guard bars, however, the patterns are optically inverted. In other words, a 1 is now indicated by a space, and a 0 is now indicated by a bar. It has the same basic structure as the UPC-A barcode.
A "UPC-E" barcode.
Note the 'human readable' digits at the foot which can be used by operators if the label becomes damaged or will not scan for some reason - "1234567" is the number encoded in the barcode.