The "wand" is the simplest and least expensive input device available. It barcode is durable and contains no moving parts. It must, however, come into contact with the readers bar code, which can present a challenge. If a bar code barcode must be read more than once, it may become smeared or damaged and, in essence, unreadable. Also, a wand is readers "human powered," which means it must be held at the proper angle and moved at the proper speed. For these reasons, a wand is the best choice when cost is the largest determining factor. The CCD, or "Charge Couple Device," is another common input barcode device. A CCD is a very "aggressive" instrument, with a high ability to read bar codes quickly and easily. readers But it has two primary limitations. barcode First, it has a short "read" range, and must be held no more than 1 to 3 inches from the bar code.

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