Casio FX-991EX Advanced Engineering & Scientific Calculator - 3" x 6.5" x 0.4"

By: Casio

Casio FX-991EX Engineering/Scientific Calculator is the ideal choice for value-conscious engineers and scientists. With a sleek black finish and a compact 3" x 6.5" x 0.4" size, this calculator offers superior battery life, accuracy, and overall performance. Get the most out of your calculations with the Casio FX-991EX!

Key Features:

The Casio FX 991EX Engineering Scientific Calculator is the perfect tool for tackling complex equations. This powerful calculator features a high resolution LCD display and can solve multi-step problems with ease. Its small size makes it portable, measuring 3" x 6.5" x 0.4". With the Casio FX 991EX, you can be sure that your calculations will be accurate and efficient.
95
B2B Rating
846 reviews

Review rating details

Easy to read
86
Design
87
Convenience
90
Build quality
88
Color range
84
Value for money
92
Overall performance
91
Accuracy
90
Display
88
Battery life and type
87

Pros and Cons

Pros
  • Features a high-resolution LCD that shows more work that helps to minimize scrolling
  • Advanced calculations allows to quickly work through multi-step problems
  • The calculator offers 2-way power that ensures reliable use in any setting
Cons
  • May not be suitable for algebra

Details of Casio FX-991EX Advanced Engineering & Scientific Calculator - 3" x 6.5" x 0.4"

  • Manufacturer: Casio Computer Co., Ltd
  • Is Discontinued By Manufacturer: No
  • Date First Available: June 19, 2015
  • Item model number: FX-991EX
  • Power Source: Solar, Battery
  • Item Weight: 3.2 ounces
  • ASIN: B00ZZ93346
  • Color: Black
  • Brand: Casio
  • Screen Size: 2.5
  • Calculator Type: Engineering/Scientific
  • Customer Reviews: 4.8/5 stars of 17,777 ratings
  • Batteries: 1 LR44 batteries required.
  • Best Sellers Rank: #37,279 in Office Products #41 in Scientific Calculators
  • Product Dimensions: 0.4 x 6.5 x 3 inches

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Comments

ix4udz: Es muy útil para la universidad, fácil de usar y muy práctica.
La recomiendo muchísimo, es tal cual como viene en la imagen

Mexico on Oct 25, 2023

Jimena: Es funcional, me ha gustado mucho, lo llevo usando desde hace 6 meses, y esta super padre, trae el manual de eso y sus funciones son buenas...

Mexico on Oct 20, 2023

V: Since im a science major, but it's a good thing to have regardless.

Netherlands on Oct 19, 2023

Adish Deep Shakya: I use it on daily basis and it has been good so far for matrix and other complex calculations.

United States on Oct 05, 2023

AA: Arrived earlier than expected, although the packaging had some marking and wear on it. Calculator had the functions I needed for grade 12 calculus class and was easy to use.

United States on Aug 16, 2023

Tabish Zaidi: I've used it for my Fundamentals of Engineering (FE) exam and it's great. Always used Casio calculators all my life, and every single one has been great. This one is no exception. I've used the older 991EX model too, and this one improves upon even that.

United States on Aug 16, 2023

Domenico: Wow! Non riesco nemmeno a contenere la mia gioia per il prodotto che ho appena acquistato su Amazon. Posso dirvi con certezza che è stata una scelta eccellente e non potrei essere più felice!

Prima di tutto, voglio sottolineare la velocità con cui l'articolo è stato consegnato. È arrivato proprio quando ne avevo bisogno, pronto per soddisfare tutte le mie aspettative. Amazon ha dimostrato ancora una volta di essere un gigante nell'efficienza della spedizione!

Quando ho aperto il pacchetto, sono rimasto immediatamente colpito dalla qualità del prodotto. Era chiaro che era stato realizzato con cura e attenzione ai dettagli. I materiali utilizzati erano di alta qualità, garantendo durata e resistenza nel tempo.

Ma non è tutto: il prodotto era esattamente come descritto sul sito. Era come se avessi ricevuto un pezzo di magia! Ogni caratteristica elencata era presente e funzionante, senza alcuna sorpresa negativa. La performance del prodotto era impeccabile e mi ha stupito.

Devo anche menzionare l'imballaggio. Il prodotto era protetto con cura e ogni dettaglio era stato preso in considerazione per evitare danni durante il trasporto. Sapevo che Amazon...

Italy on Jul 01, 2023

Alessandro: La Casio Fx-991Ex è una calcolatrice scientifica che offre una vasta gamma di funzioni e si rivela un compagno affidabile per calcoli avanzati.
La dimensione compatta della calcolatrice, con le sue misure di 1.02 x 16.51 x 7.62 cm e un peso di soli 90.72 grammi, la rende facile da trasportare e da utilizzare ovunque. Questo la rende ideale per gli studenti, i professionisti e chiunque abbia bisogno di una calcolatrice potente ma portatile.
Una delle caratteristiche più apprezzate della Fx-991Ex è la sua ampia selezione di funzioni. Con ben 552 funzioni disponibili, questa calcolatrice è in grado di affrontare praticamente ogni tipo di calcolo scientifico. Ciò include funzioni trigonometriche, logaritmiche, statistiche, di matrice e molte altre ancora. L'ampio display a matrice offre una chiara visualizzazione dei calcoli e delle formule, facilitando la comprensione e la correzione degli errori.
La velocità di elaborazione dei calcoli è notevole, permettendoti di ottenere i risultati in modo rapido e preciso. Inoltre, la calcolatrice offre la possibilità di salvare e richiamare le espressioni e i risultati precedentemente calcolati, semplificando il lavoro su...

Italy on Jun 20, 2023

Kirito Fritz: Como estudiante de preparatoria, necesitaba una calculadora confiable y versátil para mis clases de matemáticas y ciencias. Después de investigar y leer muchas reseñas, decidí comprar la Casio FX-991 Classwiz, ¡y estoy muy contento con mi elección!

Esta calculadora es increíblemente potente y cuenta con una amplia gama de funciones que hacen que el trabajo matemático sea mucho más fácil. Desde cálculos básicos hasta ecuaciones complejas, esta calculadora lo hace todo. Además, su pantalla nítida y clara me permite visualizar los resultados sin esfuerzo, incluso en condiciones de poca luz.

Lo mejor de todo es que la calculadora llegó a mis manos en tan solo 5 días, aquí en Colombia. ¡El servicio de entrega fue rápido y eficiente!

Como fan de Casio, esta calculadora no me ha decepcionado en absoluto. Casio siempre ha sido una marca de confianza para mí, y la FX-991 Classwiz no es una excepción. La calidad y durabilidad son evidentes en cada aspecto de esta calculadora.

Recomendaría la Casio FX-991 Classwiz a todos los estudiantes que necesiten una herramienta confiable y de calidad para sus estudios. No te arrepentirás de esta...

United States on Jun 14, 2023

Monica W.: You would think the high resolution screen would be the cat's meow. But it's not. For normal math calculations, the character font Casio has chosen is too small so all the numbers are too small. If you're into matrices, maybe the high resolution pays; otherwise it's a minus. But that's not the biggest problem. The biggest problem is that the screen has a dark filter over it. It's like trying to use a calculator while wearing sunglasses. You have to look at these small, dark numbers against a dark background. It makes me want to reach for any other calculator. Also it would have been nice if Casio hadn't used medium blue on a black case to identify some of the button functions.
On the plus side, this calculator is fast! I never realized how slow my TI-30XIIB was to cough up answers until I bought this screamer. If I were still taking math exams under bright lights, I'd seriously consider using the Classwiz for how fast it is.

United States on Mar 24, 2023

Casio FX-991EX Advanced Engineering & Scientific Calculator - 3" x 6.5" x 0.4" Texas Instruments TI-30XS MultiView Scientific Calculator - Ideal for High School and College Math and Science Courses Casio FX-115ESPLUS Scientific Calculator - Perfect for Advanced Math Calculations
Casio FX-991EX Advanced Engineering & Scientific Calculator - 3" x 6.5" x 0.4" Texas Instruments TI-30XS MultiView Scientific Calculator - Ideal for High School and College Math and Science Courses Casio FX-115ESPLUS Scientific Calculator - Perfect for Advanced Math Calculations
B2B Rating
95
98
97
Sale off $12 OFF $15 OFF
Total Reviews 846 reviews 2 reviews 2 reviews
Manufacturer No Texas Instruments ‎No
Is Discontinued By Manufacturer No No ‎No
Date First Available June 19, 2015 June 6, 2007 November 1, 2011
Item model number FX-991EX 30XSMV/TBL/1L1/G ‎FX-115ESPLUS
Power Source Solar, Battery Battery Powered
Item Weight 3.2 ounces 0.96 ounces ‎3.35 ounces
ASIN B00ZZ93346 B000PDFQ6K B007W7SGLO
Color Black Blue and White ‎black
Brand Casio Texas Instruments ‎Casio
Screen Size 2.5 3
Calculator Type Engineering/Scientific Engineering/Scientific
Customer Reviews 4.8/5 stars of 17,777 ratings 4.8/5 stars of 32,130 ratings 4.7/5 stars of 7,215 ratings
Batteries 1 LR44 batteries required. 1 Lithium Metal batteries required. ‎1 LR44 batteries required.
Best Sellers Rank #37,279 in Office Products #41 in Scientific Calculators #210 in Office Products #2 in Scientific Calculators #90,205 in Office Products #87 in Scientific Calculators
Product Dimensions 0.4 x 6.5 x 3 inches 9.75 x 6.69 x 1.25 inches ‎0.44 x 6.38 x 3.15 inches
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