Hello, you are searching for some great touchscreen solutions for offices and classrooms and the first brand came in my mind is Viewsonic of the rest brands. I am already using a business monitor of this brand. They provide pleasant interactive displays for education and business infrastructure.
Different sizes of screens are available starting from 55 inches to 98 inche and you will have many options to choose among them.
You can find out their all panels information here: https://viewsonic.com/me/products/viewboard/viewboard.php
Well, this is my recommendation but you are entirely free to choose any brand which you find affordable and worthy.
