I initially had a problem with this scanner reading the last digit of a 12 digit barcode. I contacted the seller and he told me how to change the settings to fix this problem. If anyone has this problem, I am attaching the instructions. This barcode reader works great now! Go to "Set Menu", select "Barcode Set", select "Barcode Validation" => "enable", go back to menu 1, select "Decode Type", select "EAN 13,UPC" . EAN13"
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