PAUL SHAMBROOM / SCIENCE PHOTO LIBRARY. PAUL SHAMBROOM / SCIENCE PHOTO LIBRARY.
Supermarket check-out counter showing bar-code reader in use. Bar codes consist of a row of parallel lines of varying thickness that permit fast error-free entry of data into a central computer. In this retail application the scanner (the light pen) is fixed, and the supermarket products with their individual codes pass along a conveyor and past the red light of the scanner, which records the bar code; details of date, unit cost, product name and other stock control data are inputted into the computer to be used for future accounting and stock control purposes.
Model release not available. Property release not required.