What is the data range of ID Scanners can they read their barcode or others as well



New Member
I am really interested in ID scanners as I an learning how to assemble them. My teacher or I should say mentor told me to find out how to read all ID with one scanner and know what it represents and I started searching the internet.(We do all kind of wacky stuffs) Then I end up with a site on id scanners which looks like a total noob job tome but after a few links I end up meeting someone online and he tells me that this scanner can get you almost any information you want from a bar code. Not top secret CIA or NASA bar codes but local bar codes from shops and departmental stores and stufs. So, if anyone advanced in this field here can you tell me how this is possible.