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From the manufacturer

Non-Programmable Scientific Calculator – CASIO fx-991MS (2nd Edition)

Sleek and attractive design: Gives a beautiful and elegant look.
Wear Resistance printing: The functions name doesn’t fade even after long usage.
Dot Matrix Display: Dot-Matrix High-Resolution Display for easy viewing of long expressions.

Casio fx-991MS is a non-Programmable scientific calculator with 401 functions. The 2nd edition of the calculator comes in sleek and attractive design. Calculator has dot-matrix display for easy viewing and entering of long algebraic functions and equations. it can solve Trigonometrical, Statistical, Integral, Differential, Matrix, Vector calculations and many more...

Calculator is made with wear resistance printing and has drop resistant body. This is powered by Solar & Battery both: Solar powered when light is sufficient, battery powered when light is insufficient.


Number of Functions : 401 401 Functions for easy and fast Calculations for all your mathematical and engineering problems	Trigonometrical Calculations Calculator can perform all trigonometrical and hyperbolic functions.	Differential and Integral Calculations Dedicated key to solve definite differential and integral problems.	Statistical & Regression Calculations Calculator can easily perform statistics, regressions and distribution problems.


Matrix & Vector Calculation Solve up to 3 by 3 matrix and 3-dimensional Vector problems	Multiple Mode Single Key to change mode for Matrix, Statistics, Regression calculation etc.	SHIFT/Alpha keys for easy operation Some functions are written in Yellow and Red colors. Use Shift key to execute yellow colored functions and Alpha key for red colored functions.	Sleek and Stylish Body Calculator has sleep design with curved edges which makes it compact, attractive, and easy to carry. The functions are printed with water resistant printing.

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	This Item Casio fx-991MS Scientific Calculator with 2-Line Display	Recommendations Casio FX-991ES Plus-2 Scientific Calculator	dummy Casio FX-991ES Plus-2nd Edition Scientific Calculator	dummy FX-991CW Advanced Scientific Calculator	dummy Upgraded 991ES Plus Desktop Scientific Calculator, ROATEE Multiview 4-Line Display with Erasable LCD Writing Tablet, Solar Battery Power with Notepad for School	dummy CTIFREE Scientific Calculator FX-991MS College Middle School Mathematics 401 Function Calculadora Cientifica Dual Power Scientific Calculator
	Buying options	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control
Price	—	-8% $25.80 List: $27.95	-12% $24.60 List: $27.99	-6% $19.99 List: $21.19	-6% $32.89 List: $34.98	$12.99
Delivery	—	Get it as soon as Wednesday, Jun 12	Get it as soon as Wednesday, Jun 12	Get it as soon as Wednesday, Jun 12	Get it as soon as Wednesday, Jun 12	Get it as soon as Wednesday, Jun 12
Customer Ratings	4.41,265	4.6221	4.68,672	4.6705	4.4506	4.48
Easy to use	4.7	5.0	4.5	4.3	3.1	—
Easy to learn	3.7	5.0	4.5	4.4	3.5	—
Easy to read	4.6	—	5.0	4.9	3.9	—
User interface	—	5.0	4.5	4.1	—	—
Sold By	—	PRIME EXPRESS ⭐⭐⭐⭐⭐	PRIME EXPRESS ⭐⭐⭐⭐⭐	Amazon.com	ROATEE-US	MANG Apparel
model name	—	FX 991ES	—	FX-991CW	—	CTIFREE Scientific Calculator FX-991MS
power source	Battery Powered	Battery Powered	Battery Powered	Solar Powered	Battery Powered	Battery+Solar Powered
battery quantity	1 lr44	1 lithium ion	1 lr44, 1 aaa, 1 lithium ion	1 lr44	2 cr2032	1 lr44
display type	—	—	LCD	LCD	LCD	LCD
material	—	—	—	Plastic	Acrylonitrile Butadiene Styrene (ABS)	Plastic

Product information

Product Dimensions

6.08 x 3.07 x 0.5 inches

Item Weight

3.7 ounces

ASIN

B0000VILI2

Item model number

FX-991MS

Batteries

1 LR44 batteries required.

Customer Reviews

4.4 1,265 ratings

4.4 out of 5 stars

Best Sellers Rank

#420,879 in Office Products (See Top 100 in Office Products)
#248 in Scientific Calculators

Is Discontinued By Manufacturer

No

Date First Available

November 10, 2006

Manufacturer

CASIO

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Product Description

Additional Features:

• Base-n calculations / conversions
• Logical operations
• Complex number calculations
• CALC memory
• Engineering symbol calculations
• 40 scientific calculations
• 40 metric conversions(20 conversion pairs)
• 9 variable memories
• Comes with slide-on case

Customer reviews

4.4 out of 5

1,265 global ratings

How customer reviews and ratings work

Customers say

Customers like the quality, condition, performance and value of the calculator. For example, they mention it's one of the best engineering calculators, it meets all of their calculation needs and is fairly rugged. Some appreciate the performance and say it'll guarantee you success.

AI-generated from the text of customer reviews

9 customers mention9 positive0 negative

Customers are satisfied with the quality of the calculator. They mention it's one of the best engineering calculators, has great features, and meets all of their calculation needs. Some say that it'll help them with maths and science.

"...This calculator meets all of my calculation needs, is fairly rugged, has an extensive built in constant library and even features approximations to..." Read more

"...It has and is still helping me with my maths and science,very easy to use and guarantee you success in what ever you use it in...." Read more

"filled with great features a nice scientific calculator" Read more

"One of the Best calculator." Read more

8 customers mention8 positive0 negative

Customers are satisfied with the condition of the calculator. They mention that it is built well, has satisfactory quality, and is new with no faults.

"...This calculator meets all of my calculation needs, is fairly rugged, has an extensive built in constant library and even features approximations to..." Read more

"Got this calculator the same as i saw it on line and it was new with no fault...." Read more

"You can never go wrong with Casio, great brand and outstanding quality.Arrived earlier than expected, and in good condition...." Read more

"this is a good calculator that gets the job done and built well" Read more

8 customers mention8 positive0 negative

Customers are satisfied with the performance of the calculator. They mention that it does the job quite well, is easy to use, and guarantees success in whatever they use it for.

"...helping me with my maths and science,very easy to use and guarantee you success in what ever you use it in.Will recommend it 100 times to any one" Read more

"...I bought a new one as an addition.It gets the job done...." Read more

"...Nonetheless, so far it does the job quite well." Read more

"It's a very good product. I like it . I can do my financial sum with this calculater. You can buy it." Read more

4 customers mention4 positive0 negative

Customers appreciate the value of the calculator.

"...amazingly awesome calculator for the price." Read more

"It has the features I needed and price is good so good value for bucks you spend, my 13 year wanted some color choices." Read more

"Great for the price!" Read more

"Excellent value..." Read more

3 customers mention3 positive0 negative

Customers like the features of the calculator. They say it has all basic functions plus a variety of others. They also appreciate the multiple functions and the solar charger eliminates the need for battery.

"...Multiple functions are in built and the solar charger eliminates the need of battery replacements." Read more

"...Perfect for any middle school and older students.Has all basic funtions plus big variety of others." Read more

"filled with great features a nice scientific calculator" Read more

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Top reviews from the United States

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Michael Bosse

Excellent value

Reviewed in the United States on January 7, 2017

Verified Purchase

I am a bit of a calculator hoarder and this is one of the best values I have found. While I usually focus on HP RPN calculators, sometimes it is nice to have something more simple around. This calculator meets all of my calculation needs, is fairly rugged, has an extensive built in constant library and even features approximations to integrals and derivatives. All in all an excellent buy.

Helpful

Jonathan Kwaning

very easy to use and guarantee you success in what ever ...

Reviewed in the United States on March 5, 2016

Verified Purchase

Got this calculator the same as i saw it on line and it was new with no fault.It has and is still helping me with my maths and science,very easy to use and guarantee you success in what ever you use it in.Will recommend it 100 times to any one

One person found this helpful

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Malibureen

Four Stars

Reviewed in the United States on August 20, 2016

Verified Purchase

The product seems to work fine but the packaging was all cut open.

Helpful

Aritra Sur

The keys are laid out in a very effective manner and makes number crunching not that of a painful job. Multiple functions are in

Reviewed in the United States on December 2, 2014

Verified Purchase

This has been a trusted companion for many years as an engineering professional. I bought a new one as an addition.It gets the job done. The keys are laid out in a very effective manner and makes number crunching not that of a painful job. Multiple functions are in built and the solar charger eliminates the need of battery replacements.

One person found this helpful

Helpful

Peterson Owusu Junior

It does the job

Reviewed in the United States on April 19, 2024

Verified Purchase

I am used to the old Casio fx-991MS Scientific Calculator and that the picture I saw to order was the old one.
I was a bit disappointed when I received the order and it was something a little bit different from what I am used.
Nonetheless, so far it does the job quite well.

Helpful

Helam

Great calculator, good for evry and anyone

Reviewed in the United States on April 3, 2018

Verified Purchase

You can never go wrong with Casio, great brand and outstanding quality.
Arrived earlier than expected, and in good condition.
Perfect for any middle school and older students.
Has all basic funtions plus big variety of others.

4 people found this helpful

Helpful

J. Sacher

Great calculator for engineering.

Reviewed in the United States on April 18, 2015

Verified Purchase

Love the engineering entry with M, K, n, p, u. Keeps from screwing up a calculation when you use the wrong power of ten modifier for micro, nano, pico, etc. It is typical the small inductors and capacitors that mess me up.

One person found this helpful

Helpful

Top reviews from other countries

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Ivan Stoyanov

Perfect

Reviewed in Germany on March 20, 2024

Verified Purchase

Exactly wha I expect.

Paul Gobui

Good

Reviewed in Canada on August 22, 2020

Verified Purchase

Great calculator. Does complex calculations with ease

Kuldeep Singh

best at this price

Reviewed in India on September 1, 2019

Verified Purchase

It's totally legidimate Casio product. Its not fake at all you can see it on Casio's website.
This is the best calculator for all the engeneering students recommend by all the professor.
Personally between the old one and the new , I like this one , it's lighter , slimmer , and looks good .
Thought it's not as good as Texas instruments calculator , but from a students point of view (price is the main concern) this is the best. I would totally recommend this for 11th,12th science and engineering students.
I used it in some exams, obviously the invigilators lack knowledge and you need to convince that the calculator is allowed. However this calculator is easy to use and has variety of functions. You just need to go through the manuals in order to perform various operations.
It is very light (when not in sliding cover). Just go for it. You may buy the ES version as it has better display. But you will br satisfied by this only.

Manolo

Producto de segunda mano en perfecto estado

Reviewed in Spain on September 4, 2018

Verified Purchase

Valoración muy positiva en cuanto al estado del producto, ya que tratándose de un artículo usado de segunda mano nunca sabes lo que te vas a encontrar. El estado es perfecto y casi me atrevería a decir que no parece haber sido usado. La caja del producto estaba dañada pero solo la caja. El artículo de su interior estaba intacto.
Valoración negativa en cuanto al servicio de entrega por parte de correos express. El día que esperaba el artículo estuve en el punto de entrega durante todo el día. Al ver que no se producía la entrega contacté por internet con la página web de correos express para hacer un seguimiento del artículo y sorprendentemente habían escrito que la entrega no había podido hacerse por no encontrarse el receptor en el punto de entrega y no haber podido contactar conmigo mediante llamada al móvil de contacto. Pues bien ambas afirmaciones son falsas. La primera porque estuve esperando en el punto de entrega (que es mi domicilo) todo el día, y en ningún momento estuve ausente lo que quiere decir que el mensajero no vino a entregar el paquete aunque en la página web escribiera que fue imposible esta entrega. Y lo segundo es que mi móvil (como todos los móviles de hoy en día) recoge y almacena todas las llamadas efectuadas tanto entrantes y salientes como perdidas, y no tengo en absoluto ningún registro de llamada entrante o perdida de ese día. Esto quiere decir de forma inequívoca que ni estuvieron en mi domicilio para entregar el paquete, ni trataron de contactar conmigo. Osea mienten de forma descarada. No está bien mentir y aborrezco a la gente que lo hace.

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DREng

Great for my Engineering Degree.

Reviewed in the United Kingdom on July 24, 2018

Verified Purchase

I love this calculator.

I also have the Casio fx-991EX Classwiz model which is easier to use in all fairness and has more functions, however I just hate how cheap it feels. The build quality of the Casio fx-991MS is far superior. From what I can see, this calculator still has all the functions you’ll ever need for A-Level Math and University.

I would highly reccomend this particular model if your looking for a scientific calculator which will do everything you need but just not as easily as the Casio fx-991EX Classwiz model with its natural workbook display.

One person found this helpful

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Brand	Casio
Color	Black
Calculator Type	Engineering/Scientific
Power Source	Battery Powered
Number of Batteries	1 LR44 batteries required.

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Casio fx-991MS Scientific Calculator with 2-Line Display

About this item

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From the manufacturer

Non-Programmable Scientific Calculator – CASIO fx-991MS (2nd Edition)

Number of Functions : 401

Trigonometrical Calculations

Differential and Integral Calculations

Statistical & Regression Calculations

Matrix & Vector Calculation

Multiple Mode

SHIFT/Alpha keys for easy operation

Sleek and Stylish Body

Compare with similar items

Product information

Feedback

Looking for specific info?

Product Description

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