HP 49g+
Big, easy to read screen, fast 3d graphing, no missed keypresses, and a SD card slot for practically unlimited expandibility.
The hinged keys can be hard to press, and the SD card slot may require fiddling to get a card in.
Posted Jan 5, 2006 - If you want the most powerful calculator available, this is it! However, with that power comes a steep learning curve. Plan to spend several hours finding your way around the menus and becoming comfortable with the interface. If you do not have time for this, then this is probably not the calculator for you. Although earlier batches of this calculator had some issues with the keyboard, I have had not such troubles. All keys have always registered exactly once -- no ddoubles or missed keypresses. It's 3d graphing abilities are excellent, and rotating the graph is very fast. It has full symbolic support, and can solve many types of equations. It can integrate and work with very large integers. For example, calculating 1000 factorial is not a problem! (This is 1000*999*998*997*...*4*3*2) If you are using it for calculus, it has no trouble symbolically solving indefinite and definite integrals. It supports Algebraic, RPN & textbook modes of input. The printed manual is incomplete, and serves only as a small introduction -- make sure to download the "User's Guide" and the "Advanced Users Reference Manual" from hp.com so you can fully utilize the calculator. The interface is a seamless experience, and with every key being user definable, you can swap out lesser used functions (ex., "1/X") with more commonly used ones (like squaring). Recommended!
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