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Customer
2025-08-27 15:06:11
The TI89 is a beast of a calculator, and can do almost any math you can throw at it. Imaginary numbers in rectangular and polar form? Check. Infinity? Check. Factoring and algebra? You bet. If you are an EE or any other engineering field, you need one of these. Literally the only downside is it's not backlit. TI - if you are listening, make another TI-89 but with a backlit display!!!
Maria Melendez
2025-08-26 16:26:50
My son is using this and absolutely loves it!
Jason
2025-08-24 18:54:29
When I bought this I didn't realize I was buying a refurbished calculator - that was my mistake, but I was OK with it as long as it was in good condition. However the calculator screen didn't work correctly. Some menu items are pixelated and it seems that some functions do not work. I reported this to Amazon and the representative walked me through the process of how to report it. The rep said I wouldn't even have to return the defective unit. Today I received a response from seller that simply says "Please return then :)". Not good customer service. Based on this experience I wouldn't recommend this supplier.
Alex Albino
2025-08-23 13:00:01
The TI-89 Titanium is an excellent calculator. It's essential for my Calc 3 and Linear Algebra classes. Unfortunately, my TI-89 Titanium was shipped with the wrong USB cable. (Refurbished)UPDATED: November 1, 2023 - Turns out the USB port inside the calculator seemed to be misaligned with the plastic casing. After manually pushing the port into place, the USB cable connection was successful.
tammy
2025-07-26 13:06:55
It would of been nice to have the instruction manual on how to work calculator! Other than no instruction manual it seems to be a very nice looking calculator. Just got it so haven’t been able to use it yet.
Miss America
2025-07-24 15:02:44
Perfect for my son - needed this for college
charles H. Lowe Jr.
2025-06-23 15:25:04
The size of the print is too small for me to work with. I had my eye-glasses adjusted with a new prescription lastmonth but the glasses are not helping with regard to the t-89.
Bit Twiddler
2025-05-26 17:28:37
I am an old guy who is taking a calculus refresher course to help me with a hobby and provide granddaughter assistance when she starts college in September. It's been 50 years since I took calculus in college and then it was slide rule and graph paper. It took me some time to figure this device out but found some YouTube videos that really helped me get going. I'm making my way thru the refresher using it. I think a young person would have a much easier time than me. It is a good and amazing device.
Sally
2025-04-25 16:37:20
Parece nueva, todo excelente, de acuerdo con lo esperado.
Jonathan Vargas
2025-02-17 15:53:54
Se ve como nueva y funciona bien. Viene la calculadora con su tapadera, pilas y cable USB.En vez de la caja original viene en una de renovado.
ignacio
2025-02-09 17:43:12
muy buen producto, funciona muy bien
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