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->TL;DR
An excellent calculator for students in STEM fields, such as physics or engineering, and a comprehensive (but not perfect) tool for professionals. It is perfect for anyone who works with paper-based calculations, whether it's a programmer checking things on paper before implementing them (sums, limits, equations, BIN/HEX/OCT operations, etc.) or an engineer solving complex systems (integrals, tangents, function values, statistical indicators, etc.). It should be noted that the typical student in primary/secondary education will not be able to fully utilize it easily.
->full read:
The calculator is perfect for an engineer who also has access to a computer for very complex mathematics. I say this because it can easily handle an exam (with matrices, complex numbers, sums, integrals, constants, unit conversions, and whatnot), but due to its screen, it is not very convenient for very large calculations that one might encounter in a professional environment.
The screen is not small, on the contrary: for an engineering student, it is just what they need! It can accommodate 3x3 matrices and nested parentheses and powers on fractions, etc. For calculating integrals with logical limits and at a university/technical level, it takes a few (1-10) seconds (attention: it only performs numerical calculations! It does not show the process! For that, go to ...WolframAlpha). Anything that doesn't fit on the screen extends beyond it (above, to the right, or both), and you can navigate with the arrow keys and cursor. One small problem with the screen is that when light falls on it at an angle, sometimes the very small symbols are a bit hard to read (but still readable).
Another important feature it has is pre-programmed calculations such as matrix determinants and inverses, conversion of polar to rectangular coordinates and vice versa (for complex numbers, for example), finding statistical coefficients, solving equations up to the 3rd degree, etc. It generally has everything in terms of pre-programmed calculations for a student.
It also has a useful sticker on the cover that provides basic operating instructions. The buttons are of average quality, not in terms of durability but they don't have very good feedback when pressed, and when someone is in a hurry, they may accidentally not press something. The symbols on and around the buttons are excellent and legible, and they have held up as new for a year now. In terms of build quality, it is very sturdy, and when it wears its cover, it can withstand a lot of beating without any damage (e.g., carrying it in a bag with other objects). Its battery has never shown any signs of weakness, and I always use it in artificial indoor lighting.
Excellent calculator. With all the basic functions, suitable for middle school and high school students as well as later on.
Easy to use and understandable.
I bought it for my school and I didn't regret the money for a single minute. It can handle very difficult calculations, from mathematics to physics, and its battery is flawless.
Very good! It even solves integrals! It saved my hands during the unacceptable remote exam where I had to solve 4 problems of infinite calculus in 1 hour...