There are many factors that can make a barcode a "bad" barcode. Moving the barcode closer or farther from the scanner won't solve many of the attributes that make a barcode "bad". It may have a wrong check digit. It may be the wrong type of symbol, or the scanner may not be programmed to see this type of symbol. It may be printed in a color the scanner has difficulty seeing. The substrate or the bars may be too reflective. The scanner may be at the wrong angle (not just distance) from the barcode. Most scanners need to see the barcoce at about 60 degrees--90 degrees is always a problem.
Can you email me a pdf of the barcode? I may be able to identify the problem from that.
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