A device that makes measurements of the bars, spaces, quiet zones and optical characteristics of a bar code field to determine if the code meets the requirements of a specification or standard.

A bar code field printed in a rotation perpendicular to the horizon so that the individual bars appear as rungs on a ladder.

Used in some hand laser scanners to project a beam of light visible to the human eye, simplifying the scanning process.

A bar code verification term. An undesirable absence of ink in a bar.