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2 days agoI just dug through the offerings of all of the niche calculator manufacturers I can think of and came up empty handed. What I would recommend in your case is the Casio fx-CG50, though. It has rubber pads on the back of the case and enough heft that it doesn’t move when placed on a desk and used one-handed. The screen is easily visible from most angles and it has the largest font of all of my graphing calculators.
You can’t increase the font size, but it is larger than the HP Prime and TI nspire CXII on large font.