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neln, you're having tough luck right now. The matter is not really screen size: there are big readers already with 9,7 inch screens The matter is that looking up charts and sheets will be rough in the absence of color. It's good enough, for example, if you have to distinguish two colors, but 16 grey scales are not something you're going to distinguish too much. Of course, many charts have graphs with different drawing patterns for distinguishing them easily, as it is assumed they will be photocopied. However, I think your best chance right now is the Entourage EDGE, the dual Android tablet and EInk reader. It is bulky, true, but it's most fitting for students (it even has a mic for recording your classes if I remember correctly). Smaller reading devices are more fitting for recreational reading, but PDF's are harder to read due to lack of sheer space.
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