FX-991MS CASIO Solar Power Scientific Calculator

Review CASIO Vintage Solar Power Scientific Calculator Tested/more

The Casio fx-991MS Solar Powered Scientific Calculator is an ideal tool for students, engineers, and anyone who requires advanced mathematical calculations with high precision. This model from Casio, a world-renowned leader in calculator technology, offers a perfect blend of functionality, durability, and energy efficiency.

The fx-991MS boasts a sleek and compact design, making it easy to carry around. Its body is constructed from high-quality, impact-resistant material to ensure long-lasting use. The calculator features a large, easy-to-read LCD display that shows up to 12 digits plus a decimal point for high precision calculations.

One of the most notable features of this calculator is its solar power charging system. The fx-991MS can be charged using any light source, even under artificial light or indoor conditions. This feature ensures that the calculator is always ready for use, even in the absence of a battery or electrical outlet.

The Casio fx-991MS is equipped with a vast range of mathematical functions, including trigonometric, exponential, logarithmic, and statistical calculations. It also offers various modes like engineering, scientific, and hexadecimal, to cater to different fields of study and professional applications.

This calculator features a multivariable equation solver, allowing users to solve systems of up to five linear equations simultaneously. Additionally, it provides a graphic interface for visualizing functions and equations, making complex mathematical concepts easier to understand.

The Casio fx-991MS Solar Powered Scientific Calculator comes with a protective pouch, allowing users to safely store and transport the calculator. The calculator also includes a battery for backup power in case of extended periods without sunlight.

In summary, the Casio fx-991MS 2000 Solar Powered Scientific Calculator is an excellent investment for anyone seeking a high-precision, durable, and energy-efficient calculator. Its extensive range of functions, solar charging capability, and compact design make it an indispensable tool for students, engineers, and professionals alike.

The Casio FX-991MS Solar Powered Scientific Calculator is a popular choice among students and professionals who require an advanced calculator for mathematical computations. Here are some pros and cons of buying this calculator:

1. Solar Powered: The calculator can be charged using natural light or artificial light, making it an eco-friendly and cost-effective option in the long run.

2. Advanced Functions: The Casio FX-991MS offers a wide range of mathematical functions, including trigonometric, hyperbolic, exponential, and statistical functions. It also has a built-in equation solver and a multi-reghold feature.

3. Durable: The calculator is built to last with its shock-resistant design and water-resistant keyboards.

4. Intuitive User Interface: The calculator has a clear and easy-to-use interface, making it easy to navigate even for beginners.

5. Compact and Portable: The calculator is small and lightweight, making it easy to carry around in a pocket or bag.

1. Limited Graphing Capabilities: The calculator does not have advanced graphing capabilities, which may be a drawback for students or professionals who require graphing functions.

2. Expensive: Compared to other calculators in its class, the Casio FX-991MS can be quite expensive.

3. Buttons can be small: Some users have reported that the buttons on the calculator can be small, making it difficult to press them accurately.

4. Limited Memory: The calculator has limited memory, which may be a concern for users who need to store large datasets or complex equations.

In conclusion, the Casio FX-991MS Solar Powered Scientific Calculator is a reliable and advanced calculator that offers a wide range of mathematical functions, solar power, and a durable design. However, it may not be the best option for users who require advanced graphing capabilities or have a limited budget. If you are looking for a solar-powered calculator with advanced mathematical functions and a durable design, the Casio FX-991MS is a great choice. However, if you require graphing capabilities or a larger memory, you may want to consider other options.

Recommendation: If you are a student or professional who requires an advanced scientific calculator with solar power, a durable design, and a wide range of mathematical functions, the Casio FX-991MS is an excellent choice. However, if you require graphing capabilities or a larger memory, you may want to consider other options such as the Casio Classpad 350 or Texas Instruments TI-84 Plus CE.

Details:

Does not necessarily equate to working. This calculator passed diagnostics and those instructions are included in this listing as an attached .PDF. If you message me through a listing and ask, I can provide with that information. It has 401 functions, 50 keys, and an LCD liquid crystal display.

Any calculator with built-inconstant and conversions is a favorite of mine. I have collected calculators for many years so am familiar with what to look for, has become more valuable, and avoid. I despise things that don't work properly especially when purported to be working. Logic formula.

Needs new batteries, no or batteries not included really. Country china. Obviously have been abused by the previous owner FYI I am second owner of this calculator listing unless specify otherwise. I despise corrosion especially with electronics.

Though not an expert, I am reasonably knowledgeable and experienced. I inspect all battery contacts of calculators and clean them as much possible so that they are in good working condition. Works perfectly. Why buy a vintage or any scientific calculator from me when you might have other choices.

This is Avery interesting basic and unique scientific calculator though packed full of features was introduced in the year 2000. Please see below for this calculators specific features. The calculator was manufacture din china. Even if the calculator is dual power .e.

Solar and battery power those batteries are replaced as well. Very good to excellent overall cosmetic condition please view pics carefully this one has some light screen wear that does not affect the display or operation in any way. Also, I do not give calculator lessons and there is learning curve for any scientific. This listing includes a downloadable .PDF copy of the Casio FX-991MS manual.

If I discover anything that might not be working as it should, the listing will include information full disclosure and item likely discounted accordingly. New backup battery installed to replace the depleted original. Have known working defects that prevent the calculator from functioning as it should those calculators would only be listed for parts or not. It takes more time to list each one but that's because I care.

I have acquired a tremendous repository of resources, manuals, and information for vintage calculators so can provide some direction to my buyers. I despise wasting shipping charges. There is a reason why this model was in production for nine years. The Casio FX-991MS is a scientific calculator with 12 digits precision and formula input logic.

I have had some unscrupulous airguns buyers in the past who actually removed parts, then claimed was not functioning properly, etc. This calculator is great due to the built-in conversions and constants a plus feature they are all listed on included slide cover for easy reference. How do you know it even works then. Listed as used but sold is no display, mention of even if it turns on or much less works.

As a superb and reliable source for vintage calculator parts. Display type LCD.

specifications vintcalc:

• brand: Casio
• mpn: Fx-991ms
• model: Casio Fx-991ms
• part type: Calculator
• country/region of manufacture: China
• vintage: Yes

seller vintcalc:

• rating: 99.5%
• # reviews: 2020
• city: grove city, pennsylvania

returns vintcalc:

• policy: no returns

payments vintcalc:

• other
• credit card: visa
• wallet: paypal

general vintcalc:

• category: Electronics > Vintage Calculators

offer vintcalc:

• best offers: true
• in stock #: 5
• sold #: 19
• options: ship-to-home
• availability: in stock
• prices: $12.50–$38.89
• item condition:
  • New – Open box
  • New
  • Used
• started: june 13, 2025

shipping vintcalc:

• carrier: usps
• service: usps ground advantage
• transit: 5-11 days
• class: standard
• type: calculated