Search  for anything...
CATIGA

CATIGA SS-991EX Scientific Calculator - Solar & Battery Powered, Multi-Function, High School & College Math, Trigonometry, Statistics, Algebra, Durable, Large Display

    • Based on 14 reviews
Condition: New
Checking for product changes
$19.99 Why this price?
Holiday Deal · 8% off was $21.82

Buy Now, Pay Later

As low as $4 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, Dec 31
Order within 32 minutes
Available payment plans shown during checkout

Features

  • 552 FUNCTIONS SCIENTIFIC CALCULATOR: Includes spreadsheet, matrix calculations, statistics, calculus, complex number calculations, equation calculations, standard deviation, vector calculations, permutations and combinations. Perfect for Advanced and Beginner courses including Biology, Chemistry, Physics, Finance and Business.
  • USER FRIENDLY FORMAT: Displays formulas and expressions as they appear in textbooks, simplifying learning and problem-solving. This feature ensures that complex equations are presented in a clear, structured manner, making it easier for users to follow along and verify their work, ultimately enhancing accuracy and understanding in both educational and professional settings
  • LARGE HIGH RESOLUTION SCREEN: The high-resolution LCD display is 32% larger than regular two-line calculators, showing intricate details ideal for advanced operations such as spreadsheets and 4x4 matrix calculations. The spacious screen allows graphs and equations to be displayed simultaneously, enhancing the clarity and precision of your work
  • DUAL POWER SOURCE: Features both solar power and a battery backup, guaranteeing continuous performance for crucial calculations, making it reliable and efficient for use in any environment
  • DURABILITY and QUALITY: Engineered with strong materials, SS-991EX withstands extensive use, providing long-term reliability. If your calculator fails to turn on, try pressing the reset button on the back. For further issues, benefit from our 365-day limited warranty. Contact us, and we'll respond within 24 hours

Brand: CATIGA


Calculator Type: Engineering/Scientific


Power Source: Dual Powered


Screen Size: 3 Inches


Product Dimensions: 6.46"L x 3.15"W


Product Dimensions: 6.46 x 3.15 x 0.1 inches


Item Weight: 5.9 ounces


Date First Available: May 17, 2024


Manufacturer: CATIGA


Country of Origin: China


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Dec 31

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Easy to use.
I've accumulated several calculators of this type which I rarely use because I have to read the manual just to add 2+2 (I don't need the answer in radians). Some of them make RPN look like an adding machine. I sat down with this one, manual in hand and... I could use it without looking at the manual. To be sure, I'd probably have to look up some of the fancier stuff, but for the type of thing I use a calculator for it was great. Cube roots, raising things to weird powers, natural logs, all pretty easy. Powered right up in dim light, visible display (I did have my glasses on thinking I was going to have to read the manual). Good construction. For the really fancy stuff I'll use a computer, but even at the computer I'm often reaching for a calculator and from now on this will be the one. My ratings: just like school - A(5) - excels. B(4) - does a solid job, could do a little better C(3) - does the job, but barely D(2 or 1)) - either doesn't work, is cheaply made or has major issues. F(0) - flat out doesn't work or is actually dangerous. Vine reviews get the same scrutiny as products I paid for. ... show more
Reviewed in the United States on July 25, 2024 by Dave G. McShaffrey
    • Amazing value in a calculator not costing a lot
I did receive this via the Vine program, and my thanks to the manufacturer/seller and Amazon for providing it! What an astounding calculator for this price. It's basically a clone of the Casio FX series, with even more features for any Casio that I've seen at this price. For a lot of people, this is perfect for back-to-school when a youngster needs a scientific calculator. For this price, you might as well buy this as a very excellent calculator, rather than a basic one you'll need to upgrade in between getting a graphic calculator. We don't have any children in current need of a calculator like this, but I like having a good one for myself, and this has such a nice display. And solar-powered too! I put it through a number of tests that all proved correct: log base 10 of 1000 equals 3, log base 9 of 81 equals 2, and what was really cool was the sine of 45 degrees reported as √2 over 2. My one quibble is the vertical spacing on the sin, cos, tan buttons, which won't detract from me giving a wholehearted 5 stars for a rating. I would have put the cos lettering slightly down, but only a millimeter and that's my OCD for you. I'd expect 99.9% of people wouldn't notice. ... show more
Reviewed in the United States on July 23, 2024 by Jean-Pierre
    • This calculator is so advanced it is scary
Review Image by Robert C. (Sanjisdad) Robert C. (Sanjisdad)
Review Image by Robert C. (Sanjisdad) Robert C. (Sanjisdad)
Review Image by Robert C. (Sanjisdad) Robert C. (Sanjisdad)
I am an engineer by trade and we can't live without our calculators. I am, however, old enough to remember starting off my trade using a slide rule. At the time of the moon launch those guys would have paid a million bucks for this computer when today you can buy this for only twenty. Even the HP calculator cost over $400 a few years later. I am amazed at this little calculator. Warning: Do NOT lose your User Manual, you will need it and the instructions are fairly decent. Now, the quality of the construction of this calculator is fairly low but it is perfect for students as well as professionals since if it breaks or gets lost, it is no big deal. They do include a hard cover slide protector to cover and protect the keypad. If you use that religiously, it should last years. By that time your basic cell phone watch will do all the same functions. ... show more
Reviewed in the United States on July 18, 2024 by Robert C. (Sanjisdad) Robert C. (Sanjisdad)
    • It's hard to find a scientific calculator with this many functions that has solar power
Review Image by S.W. S.W.
I ordered this calculator because it is always good to have a few scientific calculators around. I occasionally find myself needing to do some trigonometry at my workbench and a calculator like this is just the ticket. I really appreciate that it has a solar cell. Most scientific calculators this complex do not have solar power capability. It's such a relief to not have to worry about batteries, especially because so many things these days use proprietary batteries that are difficult and expensive to replace, if you can replace them at all. The calculator itself seems to work fine, although the interface is somewhat different from the T.I. calculators I am more familiar with. Different isn't always bad though, so I won't lower the rating because the interface is not what I am used to. Overall, this is a good calculator, and the solar capability make sit stand out. Five stars. ... show more
Reviewed in the United States on July 24, 2024 by S.W. S.W.
    • Not sure how needed Scientific Calculators are. But this is a good one.
Review Image by Alamoman Alamoman
I remember way back when I got my first TI scientific calculator. I had been out of school for a short time and it was my prized possession. So getting this new one and seeing how much improvement, I still love them. I do like math. It has taken a while to get this item. This thing is loaded with math and has a great book that explains it all, well as much as it can be. Do not lose the book as it will make this calculator work like the diamond it is. Read the first few pages to make sure it is reset. Then play away until you know what connects us all, MATH. The only thing they left out was the another way to charge the battery. They use a solar cell, which I do like. I am sure they could have put a USB somewhere. Lose 1 star for that, since even lights all can have USBs to charge the battery. ... show more
Reviewed in the United States on July 22, 2024 by Alamoman Alamoman
    • Nice device...more functions than 99.9% of us will ever need
I was looking for a scientific calculator just to do a few simple trig operations that I occasionally need to calculate and this works quite well for that and the price is phenominal considering all it is capable of doing. It easily outpaces my mathmatical needs. It has a decent size screen but basic math functions just use one of the three rows so the numbers are not very large. If basic math is all you do no doubt you'd be happier with a more basic device. The keypad seems to work well but there is no tactile touch to the keys. I like a tactile touch personally but haven't seen a hand calculator in years now that provides that. It does come with a nice cover and a small print, but very helpful, set of instructions. ... show more
Reviewed in the United States on July 20, 2024 by SadSack
    • Reliable Scientific Calculator for Students and Professionals
I recently got the CATIGA SS-991EX Scientific Calculator, and I’m quite pleased with its performance. The screen is easy to read. With 552 functions, it covers everything from basic math to advanced subjects like trigonometry, statistics, and calculus. I appreciate the dual power source, ensuring it works reliably in any situation. It is perfect for both high school and college students. Plus, the user-friendly format simplifies learning and problem-solving. ... show more
Reviewed in the United States on July 30, 2024 by Gadget Woman
    • Feels Like a Casio
Feels like a good old reliable Casio calculator. Has a similar format making it ideal for people who use those on a daily basis.
Reviewed in the United States on July 28, 2024 by David G.

Can't find a product?

Find it on Amazon first, then paste the link below.