A calculator so sophisticated with the worst display they could use. With the actual LCD displays, sensitive screens and rechargeable NiCd batteries, is out of my understanding why TI still uses this kind of display. Even cell phones have better displays to insert and show data. The contrast is not good enough and if you are under a filament lamp you can see the numbers with a ghost (two times the screen, due the shadow). If you use a notebook, cell phone and digital camera daily, you will not like this product. The resolution is not so good for the "textbook like" and to the "Advanced Large Screen Graphing" slogan.The pdf documentation is bad too, since I CANNOT PRINT the necessary pages.