Hello 🙂
Thank you for considering our plugins for your project! You are correct, a member of your staff will need to access your site through a browser to check in guests. Another generally helpful resource worth sharing is our New User Primer: Event Tickets and Event Tickets Plus Knowledgebase article.
I attempted to visit the link you provided but it leads to a 404 page. So long as the commercial scanner has QR scanning capabilities, it should work! It’s best to test the scanner with ample time before the event in case it doesn’t work.
Please let me know if this helps answer your questions and feel free to reply back with any more you have. Take care and best of luck with the site. Cheers!