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Shop Popular Mechanics readers’ favorite Amazon products of 2024 so far. Vacuums and jump starters were the most popular, plus generators, batteries, and TVs.
A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode ...