The symbol comprises the following elements:

• Leading quiet zone

• Five digits that identify the manufacturer, as assigned by The Vision Council

• Four digits that identify the product, as assigned by the manufacturer

• One mandatory check digit

• Trailing quiet zone

This symbology supports all numeric digits (0-9).

OPC uses a check digit that is based on the modulo 10 (mod 10) algorithm.

The recommended minimum symbol height is 0.25 inch or 15 percent of the symbol width (excluding quiet zones), whichever is greater. The X dimension range is from .0075 inch minimum to .015 inch maximum. The quiet zones must be at least 11X wide, where "X" is the current X dimension.