A check character is a character placed in a predetermined position in a symbol and whose value is based on some mathematical relationship of the other characters in the symbol. It is used by the scanner to validate that the correct data has been decoded. If a numeric symbology contains a check character, it is often called a check digit.

The following illustration shows many of these bar code parameters.

Bar code symbol parameters

Quick Check® 600/800 Series User’s Guide

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Hand Held Products manual Quick Check 600/800 Series User’s Guide