Calculators

Casio Calculator Scientific 12 Digits in Black Color 1pcs Code: FX-991DE CW

Key features:

  • Digits: 12 digits
  • Dimensions: 11 x 77 x 165 mm
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  • Power Supply Solar/Battery
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Description

Description

Capabilities

The Casio FX-991DE CW is an advanced scientific calculator from the ClassWiz series, designed to offer high accuracy, an easy-to-use interface, and rich features for students, university students, and professionals.

High accuracy & speed

  • Offers 23 decimal digits of internal precision and a powerful processor — significantly faster and more accurate than previous versions.

  • Powerful functions and calculations
    Includes 696 functions covering mathematics, statistics, integrals, derivatives, matrices up to 4×4, solving systems of equations up to 4 variables, 4th-degree polynomials, unit conversions, random simulations with dice and coins through the Math Box.

  • Four-shade display & Natural Display
    The high-resolution 192×63 dot-matrix screen supports 4-level grayscale, facilitating cursor recognition. Supports Natural Textbook Display, meaning fractions, roots, logarithms, and other expressions appear as in textbooks.

  • Flexible navigation & menu
    The interface is icon-based, with simple navigation, new 'OK' and 'Back' keys, and easy access to functions through integrated menus.

  • Educational tools
    The Math Box application allows mathematical simulations such as dice rolls and coin tosses.

  • QR Code & data recording
    Can generate QR Codes that allow graphs and results to be displayed online via ClassPad.net.

  • Variable & function setup
    Supports storing up to 9 variables, with a list and editing function through a special menu.

  • Dual power supply
    Operates on solar power and LR44 battery for reliability.

  • Protective case
    Includes a hard plastic case that protects the calculator, with a special anti-slip surface.

  • Manufacturer

    See full description

    Specifications

    Specifications

    Product Number
    FX-991DE CW

    Dimensions

    Type
    Scientific
    Power Source
    Solar/Battery
    Display Digits
    12
    Pocket
    No
    Colour
    Black
    Wi-Fi
    No
    Length
    10.7 cm
    Width
    10.7 cm

    Features

    Percentage
    Yes
    Euro to national currency conversion
    No
    Tax rate calculation
    No
    Square root calculation
    Yes
    Complex number calculation
    No
    Grand Total
    No
    Automatic calculation of integrals & derivatives of functions
    No
    Matrix Calculations
    No
    Cost-profit calculation
    No
    Mark Up
    No

    Important information

    Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

    See all specifications

    Reviews (2)

    Reviews

    1. 2
    2. 4 stars
      0
    3. 3 stars
      0
    4. 2 stars
      0
    5. 1 star
      0
    Review this product

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    Reviews by our members

    • Ioannis_Vintzi
      5
      4 out of 4 members found this review helpful

      Amazing tool for students of science/engineering schools. It is very fast, faster than the also amazing Casio FX-991EX and significantly faster than the Casio FX-991ES Plus 2nd Edition in demanding calculations like integrals. I mention the two above because they are often its "competitors," or at least I was choosing between them.
      I should say that I was initially looking for the famous Casio FX-991EX, but I realized that it is no longer imported/sold and has been replaced by this FX-991CW. The new CW is even faster (it has greater computational power), has some additional functions, and a refreshed design. Personally, I liked the design of the EX and wanted it; it seemed a bit more robust and had some metallic keys, unlike this one, which has a simpler and more minimalist (perhaps also more serious) black design.
      A significant change seems to be its menu, which, while perhaps more user-friendly with icons, has the downside that now to do, for example, a conversion from polar to Cartesian coordinates (POL -> REC), you cannot do it directly with a key, but you have to go to the menu by pressing 2-3 keys, making it a bit more time-consuming. However, it does have a nice menu.
      Overall, I definitely recommend it as I think it is the fastest and best in this category, especially for €32, it's a very good price. In comparison to the FX-991ES Plus 2nd Ed., it is worth it, as it is much faster and more advanced. Check out comparison videos like I did on YouTube, and you will see that it is faster than both the ES and the EX. Also, I think the difference with the ES is not very big, around €5, so spend a bit more for the CW. The CW also has a much nicer screen than the ES. Only if you found the EX in some unbelievable way (I couldn't) could you possibly consider it if you mainly liked the design or don't like the new menu. Otherwise, the CW is better in every way (after all, it is the successor to the EX).
      Sorry for my rambling, although I didn't go into details.
      In short, very fast, advanced technology with many functions, etc., solar panel (solar) of course...
      I also attach a few photos.

      Translated from Greek ·
      Did you find this review helpful?
    • Verified purchase

      • Screen clarity
      • Calculation Speed
      • Reliability of results
      • Battery life
      • Value for money
      • Construction quality
    • Amazing tool for students of science/engineering schools. It is very fast, faster than the also amazing Casio FX-991EX and significantly faster than the Casio FX-991ES Plus 2nd Edition in demanding calculations like integrals. I mention the two above because they are often its "competitors," or at least I was choosing between them.
      I should say that I was initially looking for the famous Casio FX-991EX, but I realized that it is no longer imported/sold and has been replaced by this FX-991CW. The new CW is even faster (it has greater computational power), has some additional functions, and a refreshed design. Personally, I liked the design of the EX and wanted it; it seemed a bit more robust and had some metallic keys, unlike this one, which has a simpler and more minimalist (perhaps also more serious) black design.
      A significant change seems to be its menu, which, while perhaps more user-friendly with icons, has the downside that now to do, for example, a conversion from polar to Cartesian coordinates (POL -> REC), you cannot do it directly with a key, but you have to go to the menu by pressing 2-3 keys, making it a bit more time-consuming. However, it does have a nice menu.
      Overall, I definitely recommend it as I think it is the fastest and best in this category, especially for €32, it's a very good price. In comparison to the FX-991ES Plus 2nd Ed., it is worth it, as it is much faster and more advanced. Check out comparison videos like I did on YouTube, and you will see that it is faster than both the ES and the EX. Also, I think the difference with the ES is not very big, around €5, so spend a bit more for the CW. The CW also has a much nicer screen than the ES. Only if you found the EX in some unbelievable way (I couldn't) could you possibly consider it if you mainly liked the design or don't like the new menu. Otherwise, the CW is better in every way (after all, it is the successor to the EX).
      Sorry for my rambling, although I didn't go into details.
      In short, very fast, advanced technology with many functions, etc., solar panel (solar) of course...
      I also attach a few photos.

      Translated from Greek ·
      4
    • 0
    • See all
    Questions (1)

    Questions

    23 users have this product and can help you

    Ask for the product
    consultdot

    Είναι η γερμανική κυκλοφορία αυτό τι σημαίνει για κάποιον που δεν ξέρει γερμανικά και θα ήθελε να την χρησιμοποιήσει στη Κύπρο;

    See all questions (1)

    Description & Specifications

    Capabilities

    The Casio FX-991DE CW is an advanced scientific calculator from the ClassWiz series, designed to offer high accuracy, an easy-to-use interface, and rich features for students, university students, and professionals.

    High accuracy & speed

  • Offers 23 decimal digits of internal precision and a powerful processor — significantly faster and more accurate than previous versions.

  • Powerful functions and calculations
    Includes 696 functions covering mathematics, statistics, integrals, derivatives, matrices up to 4×4, solving systems of equations up to 4 variables, 4th-degree polynomials, unit conversions, random simulations with dice and coins through the Math Box.

  • Four-shade display & Natural Display
    The high-resolution 192×63 dot-matrix screen supports 4-level grayscale, facilitating cursor recognition. Supports Natural Textbook Display, meaning fractions, roots, logarithms, and other expressions appear as in textbooks.

  • Flexible navigation & menu
    The interface is icon-based, with simple navigation, new 'OK' and 'Back' keys, and easy access to functions through integrated menus.

  • Educational tools
    The Math Box application allows mathematical simulations such as dice rolls and coin tosses.

  • QR Code & data recording
    Can generate QR Codes that allow graphs and results to be displayed online via ClassPad.net.

  • Variable & function setup
    Supports storing up to 9 variables, with a list and editing function through a special menu.

  • Dual power supply
    Operates on solar power and LR44 battery for reliability.

  • Protective case
    Includes a hard plastic case that protects the calculator, with a special anti-slip surface.

  • Manufacturer

    Product Number
    FX-991DE CW

    Dimensions

    Type
    Scientific
    Power Source
    Solar/Battery
    Display Digits
    12
    Pocket
    No
    Colour
    Black
    Wi-Fi
    No
    Length
    10.7 cm
    Width
    10.7 cm

    Features

    Percentage
    Yes
    Euro to national currency conversion
    No
    Tax rate calculation
    No
    Square root calculation
    Yes
    Complex number calculation
    No
    Grand Total
    No
    Automatic calculation of integrals & derivatives of functions
    No
    Matrix Calculations
    No
    Cost-profit calculation
    No
    Mark Up
    No

    Important information

    Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.

    Reviews (2)

    1. 2
    2. 4 stars
      0
    3. 3 stars
      0
    4. 2 stars
      0
    5. 1 star
      0
    Review this product

    Reviews photos

    Reviews photos
    Reviews photos
    Reviews photos
    Reviews photos
    Reviews photos

    Reviews by our members

    • Ioannis_Vintzi
      5
      4 out of 4 members found this review helpful

      Amazing tool for students of science/engineering schools. It is very fast, faster than the also amazing Casio FX-991EX and significantly faster than the Casio FX-991ES Plus 2nd Edition in demanding calculations like integrals. I mention the two above because they are often its "competitors," or at least I was choosing between them.
      I should say that I was initially looking for the famous Casio FX-991EX, but I realized that it is no longer imported/sold and has been replaced by this FX-991CW. The new CW is even faster (it has greater computational power), has some additional functions, and a refreshed design. Personally, I liked the design of the EX and wanted it; it seemed a bit more robust and had some metallic keys, unlike this one, which has a simpler and more minimalist (perhaps also more serious) black design.
      A significant change seems to be its menu, which, while perhaps more user-friendly with icons, has the downside that now to do, for example, a conversion from polar to Cartesian coordinates (POL -> REC), you cannot do it directly with a key, but you have to go to the menu by pressing 2-3 keys, making it a bit more time-consuming. However, it does have a nice menu.
      Overall, I definitely recommend it as I think it is the fastest and best in this category, especially for €32, it's a very good price. In comparison to the FX-991ES Plus 2nd Ed., it is worth it, as it is much faster and more advanced. Check out comparison videos like I did on YouTube, and you will see that it is faster than both the ES and the EX. Also, I think the difference with the ES is not very big, around €5, so spend a bit more for the CW. The CW also has a much nicer screen than the ES. Only if you found the EX in some unbelievable way (I couldn't) could you possibly consider it if you mainly liked the design or don't like the new menu. Otherwise, the CW is better in every way (after all, it is the successor to the EX).
      Sorry for my rambling, although I didn't go into details.
      In short, very fast, advanced technology with many functions, etc., solar panel (solar) of course...
      I also attach a few photos.

      Translated from Greek ·
      Did you find this review helpful?
    • Verified purchase

      • Screen clarity
      • Calculation Speed
      • Reliability of results
      • Battery life
      • Value for money
      • Construction quality
    • Amazing tool for students of science/engineering schools. It is very fast, faster than the also amazing Casio FX-991EX and significantly faster than the Casio FX-991ES Plus 2nd Edition in demanding calculations like integrals. I mention the two above because they are often its "competitors," or at least I was choosing between them.
      I should say that I was initially looking for the famous Casio FX-991EX, but I realized that it is no longer imported/sold and has been replaced by this FX-991CW. The new CW is even faster (it has greater computational power), has some additional functions, and a refreshed design. Personally, I liked the design of the EX and wanted it; it seemed a bit more robust and had some metallic keys, unlike this one, which has a simpler and more minimalist (perhaps also more serious) black design.
      A significant change seems to be its menu, which, while perhaps more user-friendly with icons, has the downside that now to do, for example, a conversion from polar to Cartesian coordinates (POL -> REC), you cannot do it directly with a key, but you have to go to the menu by pressing 2-3 keys, making it a bit more time-consuming. However, it does have a nice menu.
      Overall, I definitely recommend it as I think it is the fastest and best in this category, especially for €32, it's a very good price. In comparison to the FX-991ES Plus 2nd Ed., it is worth it, as it is much faster and more advanced. Check out comparison videos like I did on YouTube, and you will see that it is faster than both the ES and the EX. Also, I think the difference with the ES is not very big, around €5, so spend a bit more for the CW. The CW also has a much nicer screen than the ES. Only if you found the EX in some unbelievable way (I couldn't) could you possibly consider it if you mainly liked the design or don't like the new menu. Otherwise, the CW is better in every way (after all, it is the successor to the EX).
      Sorry for my rambling, although I didn't go into details.
      In short, very fast, advanced technology with many functions, etc., solar panel (solar) of course...
      I also attach a few photos.

      Translated from Greek ·
      4
    • 0
    • See all
    36,75 €
    5,00 €   shipping cost