Texas Instrument Ti 89 Titanium Programmable Graphing Calculator

Performed as it should

Excellent condition for been used, no complains.

I bought this for my son to use in his calculus classes. He uses is daily and has spoken about its ease of function.The biggest stumbling block to this calculator is finding a driver for the interface between the calculator and his computer. The Ti 89 is built to interface with the ancient Windows 98 OS and since we are many generations beyond that here at the house, it took some time and some doing to connect the display feature to his computer for ease of viewing the graphing feature while doing his homework.Having conquered that problem (and none too soon because it was going back if it didn't happen), he is very pleased with it and would recommend it to others, especially those who are new to higher mathematics.

Wow!!! STOP LOOKING, forget the price, since it is very reasonable, and purchase this calculator--; IF your plans include advanced High-School and College training in any sciences, engineering, physics, etc.This is far beyond a simple calculator: It is a TOOL-BOX that you, or your student can rely on to carry you through at least the next 8-10 years without having to upgrade or learn a new device. A huge piece of success is having a Tool-Box that works for you in these classes. Check the manual; 980 pages: education . com / 89t .My undergraduate work was in Electrical-Engineering and Physics and I later completed a Masters degree in Computers and am working on a Ph.D currently with an eye toward teaching. When I began my EE/PH degrees, the Professors not only taught us the material, but also recommended a Calculator to use that they would teach with. In our case it was an HP Programmable RPN Scientific. They taught us to analyze and solve problems using a single tool through graduation.Now, I've chosen this TI-89 to invest the time in learning to accelerate my progress and cary me for years.

I haven't used the newer TI model...but if it doesn't do what the TI-89 does plus more then don't buy it. This TI-89 is like a mini-Matlab. I can design programs that act similar to electronic components and graph them so that I can get a feel at how to work with those electronic components before they arrive.By the way, for those who say that it's better to do math by yourself and without using a calculator...wait till you take a class in controls and then practice multiplying a 10x10 matrix by another 10x10 matrix, and then finding the canonical form of the result on paper and during a test. GOOD LUCK.

5 stars to the unit, not the price. If you can't get this on sale here, look somewhere else before you shell out the money. This is the standard graphing calculator and it's all you will need from through high school and college. It will surely last you that long too. It's worth buying this model now instead of having to buy it further down the road, but don't think you can't find one for a better price.

Buy at risk. Buttons did not work. Calculator was used when I bought new.

I purchased a refurbished calculator, and was very pleased with what I received.Slight cosmetic damage to the top of the calculator, but all of the lettering and on and above the buttons have been restored.The calculator had a fresh look to it that was very nice to receive while still avoiding the normal high prices of this calculator brand new.I would recommend to anyone in need of a more advanced calculator that does not want to overpay for such device.