Amazon.com : Casio Touchscreen with Stylus Graphing Calculator, 4.8 (fx-CG500) : Electronics
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Make sure this fits by entering your model number. Color graphing Calculator - extra large 4.8" touchscreen LCD with Stylus. Natural textbook display High resolution extra large LCD with over 65000 colors Advanced Computer algebra system (case)
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Casio deserves a lot of credit for creating a truly innovative product that isn't constrained by outdated design conventions. Many manufacturers are still making calculators with interfaces that are decades old and don't take advantage of modern touchscreen technology. Casio started with a blank slate and designed something optimized for mathematics. The result is a machine that is a joy to use.I've owned many calculators in my life from the 1980s to the present, including classics like the HP 41-CX and HP 50G as well as various TI, Sharp and Casio scientific and engineering models. This is the first time I've used a calculator that did not require me to translate between the calculator's proprietary notation and what you would find in a math textbook or scientific paper. This is a wonderful thing!This machine is a very powerful tool for exploring and learning mathematics and, of course, calculating. The interface for entering equations and making graphs is intuitive and efficient. The display is large enough to view functions side-by-side with their graphs. The touch screen and stylus are precise and sensitive. You can buy calculators with faster processors but, in many cases, the time you might gain in calculation speed you will lose while trying to navigate their frustrating, quirky interfaces. If you love math, you owe it to yourself to get one of these. Well done Casio!
Dr. R. Court
There seems to be some confusion regarding this calculator and the ClassPad 400. I have both and the only difference between them is the CP400 has a qwerty soft menu keyboard, whilst the new model is non-qwerty. In all other respects they are identical apart from just one personal observation: the touch screen has been slightly changed for the CG500. First I noticed the reflection has changed - it's less sharp and there may be an extra element in it. The other change I've noticed is it is slightly less responsive to the stylus. Tapping did not always seem to register and sliding did not always highlight the whole selected. After using it for a couple of hours I went back to the 400 and there was a distinct improvement in response. BTW, I have two 400 and they are both more responsive than the 500.In conclusion, if you must have a non-qwerty calculator for an exam, the CG500 is an excellent calculator which will last you many years. However, if qwerty is not an issue I would advise buying the CP400 model because of the marginally more responsive screen. There is no difference between the screens when reading the calculations made, they are both just as sharp. I was hoping that Casio would upgrade the chip speed on the 500 but they haven't. Compared with the TI-Nspire and HP Prime the Casio models are slower, but they are lovely calculators to use and remain my favourites despite their bulk.
Casio, Texas Instrument, and HP each have a CAS (Computer Algebra System) graphing calculator model. I've used all three in calculus classes. My experience is as follows: 1) HP Prime - algorithms produced wrong results in calc II class. Notified HP and sold the calculator. 2) TI Nspire CX II CAS - I will admit up front that I am not a fan of the document-centric features of the Nspire series. The latest model is faster but eats up battery charge twice as fast, and has 10mb less user memory available. 3) Casio fx-CG500 - radically different user interface using a much larger screen. However, what really matters is the functionality. If you are taking calculus classes or above, you pretty much need a CAS graphing calculator. Here, the Casio fx-CG500 is a clear winner. It has more capability and features for higher math, and the user interface allows for much faster user input and all around ease of use. If you are a TI-Nspire fan, go to YouTube and search on Charlie Watson. You'll find a complete "course" on using the Casio (he uses the classpad 400 which is the same). His videos are just of couple of minutes each, and you will see for yourself in the first dozen or so videos just how much easier it is to do math on the Casio than the TI. If you keep watching, you also will see what the Casio can do that TI and HP cannot.Just so you know - I teach elementary and intermediate algebra at my local community college. I've used TI calculators since the very early 70's when they were red LEDs and used a 9-volt battery. I still have a TI-83 Plus Silver Edition, TI-84 Plus CE, TI-92 Plus, TI-Voyage 200, TI-89 Titanium, and TI-Nspire CX II CAS. As you can see, I am not a TI Nay-sayer, but in side by side comparisons with competing Casio models, Casio keeps coming out on top. I am not so sure that is surprising, since TI seems to have changed its focus from the end user to the education administrative policy makers.