4.13.1.
ITF Bearer Bars
Bearer bars help to insure that a barcode is not misread by preventing partial scanning.
ITF Barcode without Bearer Bars
4.13.2.
UPC-A Guard Bar Length
Guard bars act as reference points for the scanner to aid in proper reading of the barcode.
UPC-A Barcode without Guard
Bars Extended
ITF Barcode with Bearer Bars
UPC-A Barcode with Guard
Bars Extended 2 mm
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Software Manual