The RPG/3-rule  effectively serves programmers for RPG3. The full-hard stainless steel rule is acid-etched and enamel-filled for permanence. Weighing approximately a quarter of a pound, the rules have rounded safety corners and a non-glare, brushed finish. Rule dimensions are 2-1/8" x 15-3/8". Engraving is optional in the "Return To" block on the rule.

Charts included on the rule include the following:

• ASCII/EBCDIC Conversion
• Data Type
• DDS Keywords
• Edit Codes
• Name Type

One edge of the rule has a 10-character per inch scale backed by a 6 lines per inch scale, and it also shows inches.

The other three rule edges have scales in 10 characters per inch for the following information:

• 8 characters per inch scale for approximately 4 inches
• Calculation Specifications
• Data Description Specifications
• Extension Specifications
• File Description Specifications
• Header Specifications
• Input Specifications
• Line Counter Specifications
• Output Specifications