We've all watched a supermarket cashier scan our shopping, heard that familiar beep and seen the price appear instantly on the screen.
But have you ever wondered what's actually happening?
Here's something that might surprise you: the price usually isn't stored in the barcode!
Most ordinary retail barcodes contain a product identification number. The checkout uses that number to find the product and its current price in a database.
And there's more to barcode scanning than meets the eye.
A few interesting facts:
- Traditional laser scanners use reflected light to read the pattern of bars and spaces.
- Modern imaging scanners can read ordinary barcodes and QR codes.
- The blank spaces around a barcode are important. They're called "quiet zones" and help the scanner identify the code.
- A barcode can scan successfully but still be rejected if the checkout cannot find the product.
- The first digits of a barcode do not necessarily tell you where a product was manufactured.
- A damaged barcode might still work, depending on its type and the scanner being used.
Have you ever struggled at a self-service checkout because a barcode simply wouldn't scan?
Have you noticed that some scanners read barcodes instantly while others seem to take several attempts?
And did you already know that most supermarket barcodes don't actually contain the price?
Read our full explanation:
How Does A Barcode Scanner Work? - For More Details
There's much more involved, including how lasers and cameras interpret barcodes, why scanning sometimes fails and how retailers are introducing newer two-dimensional codes.
What experiences have you had with barcode scanners? Share your thoughts below!