A practical workflow
Use different devices
Try at least two available phones with their normal camera apps. Avoid specialist QR tools that customers are unlikely to install.
Vary the conditions
Check the distance, light and angle customers will encounter. Include the actual printed version rather than only a screen image.
Verify the page
After scanning, confirm the business, language options and final destination. A fast scan to the wrong page is still a failed test.
Avoid this mistake
Do not ask customers to install a scanner simply to compensate for poor print quality.
What to check
Record which conditions fail and change the artwork or placement before publishing more copies.
Test the whole physical journey
Check both the printed code and the page behind it. A successful scan is only the entry point: the customer still needs to recognise the business, describe an experience and understand the Google handoff. Use the final material under ordinary lighting. Keep a copy of the approved artwork so a replacement does not accidentally introduce a different destination.