While the magnifier shows the page text, a video cam views the black board at any zoom, controlled from the keyboard. The two images can be displayed side by side both in class and later at home (snapshots from the board).
Small print? Zoom, yet no line will run off the screen! Want to zoom on a picture while its printed caption is being read to you? No problem (you can even save both: one as image, the other as text). Want to zoom on a distant board? Sure. Need a snapshot? A click away. Let me see it at home!!! It’s yours. (A toy for all to envy.) Want to write under zoom? Go for it! Take it around with your laptop, say to a book store (it needs neither power nor light source).
