Casio FX-991EX Scientific Calculator | Best gift for friends

Add your review

  • High-resolution LCD
  • Advanced calculations
  • Online Visualization
  • 2-way power 
  • 500+ functions
  • Strong Body


The Casio FX-991EX is one of the best scientific calculators because it comes with 575 special functions. This scientific calculator stands out for its all-solar charge, allowing you to easily recharge it on sunny days. Also, it has a menu of instructions in languages such as Spanish, Catalan, Basque, and Portuguese.

Screen quality and size

This model belongs to the high end of the ClassWiz series and incorporates a practical high-resolution LCD screen, which allows you to obtain high-quality images and perform applications with spreadsheets or functions with QR codes. Remember that the market offers calculators ranging from a simple line with a single color to models that allow you to know the graphs in great detail. That is why many users are looking for models that present screens large enough to have better and more comfortable visibility into data.

The projection of data and information under several languages is a great advantage that this calculator presents. Also, taking into account the use you will give it, if the orientation is for the baccalaureate and ESO level, it will be enough to have a single color screen with only two lines. As the calculator range grows, so do the screens, providing the ability to observe and understand the data more clearly. However, this scientific calculator allows you to display charts and tables comfortably.

Keyboard, introduction of operations and battery

This model is available for all the basics responsible for subtractions, additions, multiplications, and divisions, which are present in all calculators, however simple they are. This is the case of the Casio FX-991SPX II, which has a wide range of special buttons, which allow us to perform up to 575 functions with 47 scientific constants. Also, this scientific calculator has a practical fraction button that allows you to quickly change the display mode of the result of a division.

Moreover, this calculator has four main silver color buttons, such as on/off, menu access, “shift,” and “alpha.” It also offers four directional buttons with which you can easily move in the menu. This model also stands out for having a solar cell on the front that allows to recharging and save the device’s battery significantly. However, in case the digits appear blurry or very clearly, you will most likely need to replace the inner battery, which you will have easy access to on the back of the calculator.

This Casio FX-991EX scientific calculator has a wide range of functions, being an ideal model in case you need to solve reverse trigonometric or trigonometric exercises, hyperbolic and hyperbolic reverses. Also, you will be able to perform calculations of roots and powers, exponential calculations, and logarithmic calculations. You can also do combinatorial root calculation and permutation, prime number factoring, and random integer generation. Likewise, you will have the opportunity to perform fractions of sexagesimal to decimal conversion and vice versa, in addition to degree calculations.

Must Read: AUKEY 10-Port Powered USB Hub | Best Gift for men

  • Large Display
  • Advanced functions
  • Solar Charging
  • Strong material
  • Nothing

Specification: Casio FX-991EX Scientific Calculator | Best gift for friends

Product Dimensions

Item Weight

Item model number


Is Discontinued By Manufacturer

Date First Available



User Reviews

0.0 out of 5
Write a review

There are no reviews yet.

Be the first to review “Casio FX-991EX Scientific Calculator | Best gift for friends”

Your email address will not be published. Required fields are marked *

Casio FX-991EX Scientific Calculator | Best gift for friends
Casio FX-991EX Scientific Calculator | Best gift for friends
Login/Register access is temporary disabled