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# What is the graphical text seen near the barcode region in Symbol Diagnostics?

In addition to graphical diagnostics, Symbol Diagnostics returns readability metrics for each NoRead result. Metrics like Symbol Contrast and Minimum Edge Contrast can help users assess the image or print quality and help in improving the existing setup. The metrics are shown at the top left corner of each NoRead barcode.

The table below shows a mapping between the displayed metric name and its full name. Please refer to the Readability Metrics to understand what each metric measures.

Full Name Displayed Name Possible Grades Symbol Contrast C A,B,C,D,F Minimum Edge Contrast EC A,F Print Growth PG A,F Minimum Reflectance MR A,F

Note: Note: Symbol Diagnostics is a feature that is activated exclusively by feature key.

Note: DM070,DM150,DM260,DM300,DM360, DM370, DM080, DM280, DM470,DM580, DM503