Answer:
When asking for a letter grade, this refers to the ANSI (also now also an ISO specification) method of verification where the bar code is assigned a specific grade level. This is called the Overall Symbol Grade and is calculated from seven individual parameter grades.
The Overall Symbol Grade can also be reported in numeric form where A=4, B=3, etc. All RJS ANSI/ISO method verifier report the grade in both formats.
RJS ANSI/ISO verifiers are Inspector 4000, Inspector D4000 w/Auto-Optic scanner and the SV Series of scanner/verifiers.
IMPORTANT NOTE: Overall symbol grade must include an aperture size and light wavelength. Examples: A/06/660 and 3.7/06/660 refer to an A grade level using a 6 mil (.006”) aperture and 660 nanometer wavelength (red).