By using the mentioned 7,5cm width the tool bc_tester cannot recognize the barcode. But the reason is, that this tool is just using a screenshot and the resolution of the screen dc is rough. You need to print it out and then scan the barcode - this works then perfectly on our end. Maybe you need to use the property “Print Optimization” (only has an effect on the physical printout with a real printer device) - see also Barcode Printing Optimization.