This design helps users with reading difficulties easily grasp the current line they are on. Its length is 120 mm, and the width of the reading gap is about 5 mm. To make it easier for users to move the reading material more freely when turning pages, I have deliberately designed several raised areas on the edge of the page. If you have friends with limited dexterity in your hands, you might as well print out this tool and give it to them. I'm sure it will come in handy.
In addition, we have thoughtfully included a 150-millimeter version in the file, which is particularly suitable for use in books with larger openings.