Hand-held or stationary devices used to read information contained in a barcode are termed as Barcode Scanners. Devices like Slot Reader, Barcode Scanners, Game Controllers are very much common these days. You can easily do Price comparison for them. These are the devices connected to a computer through any type of port.

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There are different varieties in which Barcode scanners are available. They can be hand held and hands free, scan engines, laser, wearable, rugged or digital. Pen-wand scanners are perchance the simplest types of such devices. They have to be kept in direct contact with the barcode to be held at a precise angle. A pen-wand scanner is moved over the bar to read it. Used at checkout counters and hospitals there are general purpose scanners which are used to process identification documents. There are other kinds of scanners, which are rugged scanners generally used in harsh or extreme conditions.

Coupled to the computer through well-matched ports, the barcode scanners consist of an internal decoder and a cable. Light source, a lens and a photo conductor translating optical impulses into electrical ones are also there in bar code scanners. Additionally, there are decoder circuits which are available in all barcode readers. It analyzes the barcode's image data provided by the photo performer and sends the barcode's content to the scanner's output port. Advanced readers use laser-scanning technology. Barcode readers are available in several forms.

Image scanner and a laser scanner also act as another major distinction of barcode scanners. A camera reader is embedded in an image scanner which captures the barcode images. These images are then processed by sophisticated image techniques to decode the barcode. An image scanner can read a barcode from four to ten inches away. There are Laser scanners which uses lenses to read the codes. Laser scanners enjoy the advantage of reading the bar even from a distance of 24 inches. Moreover, a laser scanner can be positioned at any angle to read a barcode. With the advancement of technology, modern laser scanners can read the barcodes with ease from a distance of 30 feet.