Barcode Readers
- The bar code is a pattern of thick and thin bars divided by thick and thin spaces. Only the relative separations and thickness of the bars are important.
- Barcodes can be printed in different sizes and colours. The barcode is read either by passing a light-pen over it or by passing the bar code over a flatbed scanner.
- Barcodes are suitable for data input when all that is necessary is to identify an item, and the data input simply comprises a code.
- systems are easy to operate and have very low error rates.
- Occasionally, a scanner can read a barcode number incorrectly. A check digit is included in the barcode number to reduce such incidents
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