The article number is represented by a machine-readable symbol, printed to well-defined specifications.
Article numbers for consumer units are always represented by standard EAN-13 symbols - for 13 digit numbers and EAN-8 for 8-digit number.
The bar code consists of a series of light and dark vertical parallel "bars" and is normally incorporated as part of the original packaging design. There are, however, alternative methods of applying the symbol such as adhesive label, swing tickets, header cards, etc.

The first 3-digits identify the nationality of the organisation issuing the bar code. "489" is the prefix of Hong Kong.


This 4-dight is the code of the manufacturer is known as the Manufacturer Number.


This 5-dight item number is allocated by the manufacturer to each of its specific product.


The last digit serves as an accuracy check on the entire number by scanning devices.


The last digit is an all important "fail safe" for accuracy of scanning. The check digit is derived by a modulo-1O calculation from all the other digits in the number, via the following procedure.
STEP ONE:    Starting with the second digit in the number, add up all the alternate digit values - EXCLUDING THE CHECK DIGIT - from left to right.
STEP TWO:   Multiply the above total, of Step One, by 3.
STEP THREE:   Total the remaining, un-added, digit values.
STEP FOUR:     Add the result of Step 2 to the result of Step 3.
STEP FIVE:      The modulo-1O check digit, therefore, is the smallest number, which, when added to the result of Step 4, produces a multiple of 1O

The following example calculates the check digit number for 489 1234 56789? .....

STEP ONE: 8 + 1 + 3 + 5 + 7 + 9 = 34

STEP TWO: 34 x 3 = 102

STEP THREE: 4 + 9 + 2 + 4 + 6 + 8 = 33

STEP FOUR: 102 + 33 = 135

STEP FIVE: 135 + ? = 140

The check digit number, therefore, is 5 and the complete number

is 489 1234 56789 5

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