You have a tricorder? How did you come into possession of it, if you don't mind my asking? [He so needs to keep a closer eye on the shops! His AU-self had had all kinds of cool stuff along those lines, alas he does not.]

But I guess it's not surprising that it doesn't pick up the Malnosso-brand of technology. Theirs seems to be unlike anything else in any world, by all accounts. Still. The barcodes have to give off some kind of signal, and possibly store information as well...