Gone are the days of inputting manually exact item numbers and prices when purchasing. A symbol barcode scanner seems to think and work for us. These are usually handheld, though they may be stationary, often gun-like devices able to decrypt special symbols or series of parallel lines of varying thicknesses, called a barcode. These scanners have brought speed wherever they have been placed increasing stores’ revenue. Their workings are intricate and effective, as we shall see. Many kinds of scanners exist. The next time a scanner is spotted from a busy checkout line, one can be thankful…think how long the [...]