A data matrix bar code is used on almost very product which is found in stores. The data matrix bar code is used to identify a product and find the price in a computer system.
It is a bar-code variant, code128c https://en.wikipedia.org/wiki/Code_128
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Look on the case near the bar code.
"There are a number of places online where you can buy a bar code printer. Zebra makes bar code printers, which you can purchase at their web site. You can also buy them from Brother, which also makes bar code printers. Just go to their company web sites and choose one that most appropriately fits your needs."
Most bar code scanners will give you the price of an item , but if you are shopping and find one that does not , the price will come up at the checkout when you plug the scanner in .
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You can find out how many you have in stock, the name of your supplier and the current shelf prince, if you can only locate the bar code.
On the back cover, usually on or near the bar code.