QR codes are back on every booth banner. Most of them are wasted. They open a 60 MB PDF, the visitor's data plan groans, they close it, and nothing is captured. That is not a lead channel, it is decoration.
A QR is only as good as where it lands
Scan a good one and three things should happen. The visitor sees a fast, mobile-first catalog with fair-walk-in pricing. They leave a name and email to continue, with a clear consent step. And that becomes a contact in your inbox with the products they viewed attached, while they are still in the hall.
Now the same printed sheet replaces hundreds of paper catalogs and produces measurable leads instead of guesses.
The part nobody designs for: after the fair
Fair visitors scan a dozen booths in a day and forget all of them by dinner. So the buyer side matters too. If a visitor can pull up everything they scanned, on their own phone, and share that shortlist with a colleague by WhatsApp or email, you stay in the conversation long after the hall lights go off.
And the same QR works next year. New prices, same link on the same banner, no reprint.
One QR, one printed sheet, every visitor, full analytics. That is what the square on your banner is supposed to buy you.
The technology is boring. The discipline of pointing it at the right page is what makes the booth pay back.