Bar code is the most economical and practical automatic identification technology. It has the following advantages

1 input speed: compared with the keyboard input, the speed of the bar code input is 5 times the keyboard input, and can realize the "instant data input".

2 high reliability: keyboard input data error rate is 1/300, the use of optical character recognition technology error rate is 1/10000, while the use of bar code technology error rate less than 1 million.

3 flexible and practical: bar code identification can be used as a means of identification, but also can be used as a system to achieve automatic identification and related identification equipment, but also can be connected with other control devices to achieve automatic management.

4 bar code label is easy to make, there is no special requirements for equipment and materials, identification equipment is easy to operate, do not need special training, and equipment is relatively cheap, in the retail industry, bar code is generally affixed to the packaging of goods, so its cost can generally be ignored.

5 large collection of information: the use of the traditional one-dimensional bar code can be collected at a time of dozens of characters of information, two-dimensional bar code can carry thousands of characters of information, and a certain amount of automatic error correction.