Casio FX-991DE X ClassWiz Scientific Calculator with Natural Display

Price: €35.29 - €28.99
(as of Nov 02, 2025 16:09:52 UTC – Details)

From the manufacturer

Functions:

Display

The good resolution increases clarity in all areas. This allows the display of an icon menu instead of the classic text menu. Furthermore, this virtually eliminates the need for the previous use of abbreviations. A predominantly German menu navigation is integrated.

spreadsheet

This application allows the user to use the basic calculations of a spreadsheet calculator for the first time on a technical-scientific calculator. Possible calculations include Sum Calculation, Product Calculation, Mean, Maximum and Minimum commands.

Systems of Equations and Matrices

The optimized equation solver now also supports solving fourth-order equations, inequalities and systems of equations. It is also possible to work with 4 x 4 matrices.

Value Table

Value tables can now be output for 2 functions. New editing options improve working with value tables. This means that additional values can now be added and added manually or additional values can be automatically generated at the touch of a button.

FX-991DE X

The new generation of scientific calculators

The Classwiz series offers a new high-resolution 192 × 63 pixel LCD display that is four times the resolution of the well-known FX-DE Plus series. In addition, the computers have new hardware with a 4x faster processor (compared to the FX-DE Plus series) and double the memory.

Casio FX-991DE X ClassWiz

Technical Scientific Calculator

Casio presents the new technical-scientific calculator FX-991DE X of the ClassWiz series with numerous innovations. The popular FX-991DE Plus has been further developed and equipped with innovative functions, such as the QR code function.

June 2017:

The Society for Education, Information and Media e.V. (GPI) has awarded the technical and scientific calculator Casio FX-991DE X ClassWiz with the Comenius EduMedia seal.

Four times higher resolution display German menu navigation and notation spreadsheet QR code function for results visualisation on your smartphone or tablet Systems of Equations & Matrices Integral & Differential Buttons for X and option for easier operation

Distribution Functions

The various distribution functions, especially the normal and binomial distribution, allow extensive calculations, whose inputs can be carried out more clearly with the new display.

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The distribution functions allow the calculation of individual values as well as comfortably of entire lists, which are then clearly presented on the new display.

Units & Constants

The clear display of 47 updated nature constants and 164 unit conversions eliminates the use of a reference card.

regression

Data adjustments can be made in the completely revised application. Once entered data can be easily calculated with different regressions. Various regression types are available.

QR code function*

Display content

The newly available QR code function allows you to visualise results of the technical-scientific calculator with your smartphone or tablet.

Scan QR Code

The result display is converted into a QR code by pressing a button on the calculator. This can then be captured with your smartphone or tablet.

Content visualization

With the help of the CASIO web service, graphs, diagrams, accessibility aids and tables for the captured data can be displayed and optimally displayed.

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Customer Reviews

4.7 out of 5 stars 28,270

4.7 out of 5 stars 1,154

4.7 out of 5 stars 4,743

4.7 out of 5 stars 1,271

4.7 out of 5 stars 1,900

Price

€28.99€28.99 €29.86€29.86 €26.99€26.99 €27.36€27.36 €21.99€21.99

Functions:
696 593 502 325 325

Display
192×63 192×63 96×31 192×63 192×63

QR Code

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spreadsheet

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Solving Equations

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Matrices and Vectors
4×4 – no data
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Integral and differential

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Units and Constants
164/47 164/47 164/47 no data
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Value table with 2 functions

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Power supply
Solar and battery Solar and battery Solar and battery Solar and battery Solar and battery

Batteries ‏ : ‎ 1 CR123A batteries required. (included)
Is Discontinued By Manufacturer ‏ : ‎ No
Language ‏ : ‎ German
Product Dimensions ‏ : ‎ 16.6 x 7.7 x 1.1 cm; 90 g
Date First Available ‏ : ‎ 28 Mar 2015
Manufacturer ‏ : ‎ Casio Europe GmbH (Office Parent)
ASIN ‏ : ‎ B00VB2ISDM
Item model number ‏ : ‎ FX-991DE X
Country of origin ‏ : ‎ China
Guaranteed software updates until ‏ : ‎ unknown
Best Sellers Rank: 11 in Stationery & Office Supplies (See Top 100 in Stationery & Office Supplies) 1 in Scientific Calculators
Customer reviews: 4.7 4.7 out of 5 stars 28,270 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‚A‘, ‚ready‘).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‚acrLink-click-metrics‘, ‚click‘, { „allowLinkDefault“: true }, function (event) { if (window.ue) { ue.count(„acrLinkClickCount“, (ue.count(„acrLinkClickCount“) || 0) + 1); } } ); } }); P.when(‚A‘, ‚cf‘).execute(function(A) { A.declarative(‚acrStarsLink-click-metrics‘, ‚click‘, { „allowLinkDefault“ : true }, function(event){ if(window.ue) { ue.count(„acrStarsLinkWithPopoverClickCount“, (ue.count(„acrStarsLinkWithPopoverClickCount“) || 0) + 1); } }); });

Scientific calculator with natural display i.e. fractions, square roots and other mathematical symbols are displayed as shown in the textbook
High-resolution LC display with 193 x 63 pixels with four times the resolution of the well-known displays of the FX-DE Plus series
With 696 functions, the FX-991DEX calculator is the most powerful technical-scientific calculator model
The memory capacity has been quadrupled and allows extensive statistical calculations with four times faster processor performance
The QR code function allows the result to be displayed on your smartphone or tablet
Software language: German