Today, many commodities such as food, drinks, books, TV, refrigerator, etc., are printed on the packaging on the product bar code (also referred to as "bar code"). So, what use is it product bar code? Goods can be said of "hukou" or "identity."

    Product bar code is placed by a set of rules, scale and color have a certain rule "Article", "empty" and the corresponding numeric characters "code" component, must show that the information trademarks. "Article" and "empty" by the shades are not the same, and must be satisfied with two color optical contrast indicates that demand. "Article" is dark, "empty" is pale. This "article", "empty" and the character corresponding to the "Code" represents the same information for the scanner to read the former knowledge, which directly read the confession may know through the keyboard to the computer using the input data. Store after purchase, the price of goods through barcode scanning the bar code number to the product, company name and other information entered into the database. At the time of purchase of goods, simply enter the bar code information, the computer can find this item and the moment.

    There are two categories of product bar codes: EAN bar codes and UPC barcode, China currently used mostly for EAN bar codes. EAN bar code standard version has 13 identification number, as long as the shortened version of the eight identification number. Standard Edition 13-bit numbers, several former and vendors by the prefix code components, prefix unified management and distribution by the World Article Numbering Association. China's prefix code is 690,691,692, the United States and Canada 00-13, 45, 49 Japan, Hong Kong 489, Taiwan 471, etc., which identify the origin of the goods is a great effect. Together, the difference between the price of goods is identified by a different code, not the same price of the commodity can not use the same code. Thus, in the depicted coding, we must ensure the uniqueness of a product code.

    Advantages of using the bar code of goods is not only to avoid posing, safeguard the interests of consumers, and improve the speed and accuracy of billing after the acquisition of goods, capital goods can be dropped, added benefits.

As the State of the product bar code print quality requirements must be, if you find that the print quality have questions, such as: printing vague rough, jagged strip empty quiver, the use of the color red, etc., then this product barcode there may be spoofed that this product will likely have doubts.