If a retail market or a manufacturing unit is not using barcode scanners, then it is obviously not of a high standard. These gadgets are, in easiest form, a handheld apparatus which is used to scan bar codes on objects to monitor their stock levels and path through the supply chain.

With technology these days taking up such a major share of our daily routine and life, the use of irregular white and dark columns to identify different items is not a big surprise. What is amazing though is the manner in which barcode readers have spread into so many aspects of life.

For your everyday person, the most common place where barcode scanners are seen is in supermarkets and retail outlets. The items that one buys are scanned under a handheld device emitting a red light or passed over a senser that is fixed in a counter. Subsequently, the costs, the model number, the brand, etc display on the computer screen. Inside a few minutes, hundreds of items are passed under a scanner, and the line in the supermarket disappears in no time. Not only in the retail sector, but barcode scanners and readers are being used in many sectors.

The general concept of a barcode scanner is a light source, which is either a photodiode or a laser light, a lens and a sensor on which the light read from the codes creates an electrical impulse that is read through a sensor. With the advancement of technology, the different components have changed but the general idea of barcode scanners and readers has remained unchanged. The most recent addition to the innovation in barcode scanners and readers has been 3D and 2D readers.

The basic version of these readers are available as a hand-held apparatus which emit light from a photodiode, from a pen or hand-held device. By moving across in a gentle uniform motion, the reflected light from the bars and the spaces is detected by the photodiode and creates a waveform. These pen type scanners and readers and classed as the simplest of such devices.

The next development was in the form of laser scanners. These barcode readers use laser light to transmit onto the code bars and can detect it with a photodiode. The formation of a wave form is similar to the pen readers. With the advent of charged coupled devices as the modern technology, their use was seen in CCD scanners. These devices consist of hundreds of light sensors in a row and generate a voltage pattern correspnding to the bars and spaces of the barcode. The essential dissimilarity is that these CCD readers detect light that is ambient from the bar-code without needing a light source of its own, while pen readers emit light from the device.

All these types of scanners have found use in many different industries and different applications. They, can read barcodes placed nearby, as in supermarkets or can also scan codes from several meters as in manufacturing plants. They have significantly simplified all elements of the supply chain and allow for complete and accurate monitoring at all times.