This barcode is divided into 4 parts, from left to right:

Digits 1~3: ***3 digits are country codes (690~695 are all China Continental code, assigned internationally).

Digits 4~8: ***5 digits, representing the manufacturer code, applied by the manufacturer and allocated by the country.

Digits 9~12: ***4 digits, representing the factory product code, determined by the manufacturer.

The 13th digit: ***1 digit, which is the check code, calculated from the previous 12 digits according to a certain algorithm.

Extended information

The encoding of product barcodes follows the principle of uniqueness to ensure that product barcodes are not repeated worldwide, that is, a product item can only have one code, or one The code can only identify one product item. Products of different specifications, different packaging, different varieties, different prices, and different colors can only use different product codes.

The standard size of product barcodes is 37.29mmx26.26mm, and the magnification is 0.8-2.0. When the printing area allows, a barcode with a magnification of 1.0 or above should be selected to meet the reading requirements. The smaller the magnification of the barcode, the higher the printing accuracy requirement. When the printing accuracy cannot meet the requirements, it is easy to cause difficulty in reading the barcode.

Since the reading of barcodes is achieved through the color contrast of the barcode bar and space, in general, as long as the color can meet the contrast (PCS value) requirements, it can be used. Usually, light colors are used for hollows, such as white, orange, yellow, etc., and dark colors are used for strips, such as black, dark green, dark brown, etc.

Baidu Encyclopedia - Product Barcode