OA-991ES Plus Scientific Calculator with Natural Formula Visualization Display 417 Functions Dual Power & Lightweight Design for High School Students & Teachers

Excelente

This calculator is a useful tool for simple math. The solar and battery operation is reliable, and the display is clear and easy to read. It’s lightweight yet durable. It's easy to navigate all the functions, but this calculator gives some answers in fraction form. Sometimes this wasn’t a problem for me, but it was inconvenient on tests. I couldn't figure out which function converts the fraction to a decimal or if it had a function like that at all.

I am quite pleased with this calculator. It comes programed with multiple functions, in some cases going beyond a typical scientific calculator. Vector, matrix, probability, integral, or statistical calculations, this calculator can handle surprisingly many of them. As a primary user of TI calculators, I found transitioning to the Dupota calculator a bit challenging due to the learning curve. As long as the protective buyer is okay with that, this solar calculator is extremely powerful and a great choice.

This calculator has been a great tool for school! The 552 functions cover everything I need, and the two-line display makes it easy to track my calculations. It’s reliable, and the solar battery is a huge plus for not having to worry about changing batteries.

Had to get a non-graphing for a university course. This one fits the bill, sustains small drops, and is pretty comfortable to hold.

It got the job done!

The OA-991EX Plus Scientific Calculator is an excellent choice for both students and instructors. It includes 552 functions and can readily handle everything from elementary algebra to more complex computations. The two-line display includes both the issue and the answer, making it simple to follow along. With solar and battery power, you won't have to worry about running out. This calculator is reliable, simple to use, and ideal for students!

Do not recommend this product. It was giving me divisons in fractions instead of decimals and there arent any instructions online on how to change it. Support your product. Waste of money.