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They are commonly used at checkout stations in retail, gas pumps, as well as to read employee ID cards. A laser scanner uses a system of mirrors and lenses that allow it to read barcodes regardless of their position. It performs up to 500 scans per second to reduce the possibility of errors
A barcode reader is an optical scanner that can read printed barcodes, decode the data contained in the barcode to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor for translating optical impulses into electrical signals.