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Barcode reader.

Bar code reader - A device used to capture the data encoded in a bar code symbol. It consists of two parts: a) the scanner, an input device which sends signals proportional to the reflectivity of each successive element of the symbol to the decoder, and b) the decoder, which examines the signals from the scanner and translates them into recognizable or computer-compatible data. The decoder itself is sometimes erroneously called a reader.