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by Marshall Brain

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Please copy/paste the following text to properly cite this HowStuffWorks article:

Brain, Marshall.  "How UPC Bar Codes Work"  01 April 2000.  HowStuffWorks.com. <http://electronics.howstuffworks.com/gadgets/high-tech-gadgets/upc.htm>  10 February 2012.
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Gadgets Deconstructed

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Inside this Article
  1. Introduction to How UPC Bar Codes Work
  2. How is the Price Determined?
  3. What is a Coupon Code?
  1. Can I Decode the Bars?
  2. Lots More Information
  3. See all High-Tech Gadgets articles

Lots More Information

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Inside this Article
  1. Introduction to How UPC Bar Codes Work
  2. How is the Price Determined?
  3. What is a Coupon Code?
  1. Can I Decode the Bars?
  2. Lots More Information
  3. See all High-Tech Gadgets articles
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