This brief, free webinar is an opportunity to learn about ShelfReader, a freely available web application developed by Corey Wetherington and Scott Wagner at Penn State University Libraries. This application is being used by nearly all of Penn State’s libraries. The user interface presents a visual display of shelved items and indicates which books need to be moved and where they need to be moved in order to correct shelving mistakes.  It also flags items that have item record metadata errors.  In recognition of the benefits ShelfReader provides to library patrons, Corey and Scott received RUSA/ETS’s 2020 Best Emerging Technology Application Award sponsored by LibraryH3lp and Chatstaff.