>Hi!
>
>I find many fonts to print code bars but the reader can't read what I print. Other like package of biscuits, my monitor serial number the reader do her job.
>
>Someone could give me a font that I can print and I can read or explaim me what I need to do.

Some bar codes require start and stop characters. For example, if you want to create a readable bar code of the number 12345, you must print *12345* or !12345! in the bar code font.

Also be sure your reader can read the code. Biscuits, monitor etc. are likely UPC or EAN but commonly used non-commercial bar codes are Code39, Codabar, etc.

You will also need to use a laser printer, as ink jets and dot matrix are not good for this task. Start with a medium font "weight" if available and use a font size that gives you a height similar to a commercial UPC bar code.