Interested in reviews of Casio FX 991 CE X? It got 4.9 out of 5 stars from our customers. Find specific customer reviews of Casio FX 991 CE X below. We will appreciate if you also share your experiences with Casio FX 991 CE X after purchasing.
komplikované zadávanie údajov(je treba si na zopár hodín sadnúť a vyskúšať na nej všetko, lebo väčšina možností nieje intuitívna)
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Jana, Čachtice
Rated 08/12/2021, variant Casio FX 991 CE X
Verified purchase
many features
Small display, digits are very small in more complex calculations.
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Jozef, Bratislava
Rated 21/09/2021, variant Casio FX 991 CE X
Verified purchase
Quality, features, QR code generator, graphs, tables, etc.
Excellent price-performance-quality-appearance ratio
Ideal for high school students
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Róbert, Malacky
Rated 24/05/2020, variant Casio FX 991 CE X
Verified purchase
Functions, solar powered.
Mensie numerals and letters.
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Ivan, Žiar nad Hronom
Rated 27/02/2018, variant Casio FX 991 CE X
Verified purchase
Super calculator and price. Casio is my favorite brand in this segment
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ProtoWay s. r. o., Bratislava
Rated 01/11/2017, variant Casio FX 991 CE X
Verified purchase
Quality workmanship. Lots of features.
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Lukáš, České Budějovice 11
Rated 10/07/2026, variant Casio FX 991 CE X
Verified purchase
purchased in 2023 and still going strong; it’s been a great help both at secondary school and at university
lots of features
The display is not entirely easy to see in certain lighting conditions
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Reply from Alza
16/07/2026
Hello, thank you for your suggestion, on the basis of which the supplier contacted us and would like to respond below.
"Hello, you can adjust the display contrast to suit the lighting conditions in the calculator menu:
Press SHIFT
Press MENU (SETUP)
Select Contrast from the menu
Use the ← and → arrow keys to adjust the contrast. "
Please do not hesitate to contact us in case of need. Thank you and have a nice day, Ondřej - Alza expert
Barbora, Praha 10 Vršovice
Rated 24/03/2026, variant Casio FX 991 CE X
Verified purchase
Supplied with a dead battery.
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Company
Rated 24/03/2026, variant Casio FX 991 CE X
Verified purchase
Has Casio ever done anything wrong? Not for me.
CASIO
Solar
The cloud of features
Czech
display could have faster fps (noticeable ghosting during rendering)
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Lukáš, Brno 24
Rated 06/03/2026, variant Casio FX 991 CE X
Verified purchase - review from a price comparison website
Lots of features
Table of atomic masses
Cannot square root complex numbers
Limited number of rows in the function value table
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Reply from Alza
02/04/2026
Hello, thank you for your suggestion, on the basis of which the supplier contacted us and would like to respond below.
"The calculator does not support calculating the square root of complex numbers. The instrument can only perform basic arithmetic operations and integer powers. Calculations with complex numbers are not included because they are not part of the school curriculum for which this calculator was designed. Regarding the function value table: the table is limited to max. for 30 lines. Therefore, it is necessary to select the start value, end value and step to match this constraint. If the selected parameters lead to more than 30 rows, the calculator will display an error message. This limitation is mainly due to the limited memory capacity in order to maintain the reliability and simplicity of the instrument. Alternatively, if you need these additional features, we can recommend the FX-CG50, which offers enhanced mathematical capabilities. "
Please do not hesitate to contact us in case of need. Thank you and have a nice day, Ondřej - Alza expert
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