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# What does a blue rectangle around the barcode indicate in Symbol Diagnostics?

A blue rectangle indicates that Checksum verification of this barcode failed. Common causes for Checksum validation failure are as follows (please check the corresponding Tech Note for detailed images that illustrate each case):

- Damaged barcode (barcodes can be folded and aligned such that all the data characters decode, but it is a NoRead still, as checksum verification is not passed)

- Incorrect pattern is printed (the encoded string and the printed barcode pattern don’t match and if the symbology supports Checksum, then the decoder can indicate such failure)

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, DM380, DM503