CASIO FX-991EX Advanced Engineering/Scientific Calculator (UK VERSION), Black

Outside of a graphing calculator, which is a much more expensive and complex proposition, this has to be the best you can get. Casio has spent years refining the way these things work, and it shows. The keyboard, for instance, is faultless. The display, considering it's not backlit, is very clear, and higher resolution than in previous models so you can have more rows in a table or spreadsheet. It's a very fast calculator too, with most operations happening instantly. Mostly it works on solar power, and there's a little 'sun' icon to tell you this is happening. If the light's too dim, the LR44 backup battery will take over, and since this is just about the most widely available button cell battery, you should be able to replace it easily and for peanuts.The range of functions on offer is amazing – almost too much until you get your head around them. Might be worth watching some YouTube videos for this. There are quite a few on this calculator and others that work like it does. One cool feature is the 'QR code' creator that puts a QR code on the screen you can scan with your phone to get graphical representations of functions through the Casio app that you would be able to put into projects. Nice.If you're tempted to get a cheaper brand to save a couple of quid, don't bother. This is such a low price you may as well have the best. You won't get the great keyboard with a cheaper brand, or the speed, or the cool carbon-fibre effect body. Casios are always well built and last forever. This one weighs nothing but feels good and well built although the hard case it fits into is a little bit rattly and being white will show dirt.My only other criticisms are that some of the text on the keyboard is a bit too small to read comfortably, especially on the textured surface, and the same thing applies to some of the text on the screen too, like the list of scientific constants. And this comes in a blister pack that you have to destroy to open instead of a simple box you can keep. Small beer.Really, this is about as good as it gets. It's outstanding. Just get one.

Great calculator as it does the job and is suitable for exams; the size is perfect; it's value for money; plus it's solar powered so no need to worry about batteries, can't find anything wrong with it.

For my degree I needed a calculator that could do slightly more advanced stuff than a regular Casio, such as Matrices. This calculator does it all, sometimes it even feels like cheating! It's also pretty good at the more basic stuff, like being able to solve a lot of algebra. Handy if you need to check an answer quickly without substituting values back in, or if you just need a nudge in the right direction.If you can find a copy of the instructions for this calculator online, it tells you what it can do, which is quite a lot!I'm not great at Maths, but I needed to pass a small for my degree. This calculator really helped give me that extra push.My only complaint is that the text is a little small and hard to read. I have relatively good eyesight so this doesn't bother me, but someone with worse eyesight; especially without glasses, may struggle with this calculator screen.

I have used Casio calculators for many years. My last one has lasted over thirty years and is beginning to show it age.I needed something close to the same functionality but could not find it. Even this one does not match up and is far more fragile but I do like the display and the way it has separated out the various functions. The natural display of fractions and algebraic symbols is a definite plus even if the font is old fashioned. For myself I needed a strong statistical section but proper matrices is missing with what there is being limited to a 4x4. Calculus is missing and not to be found at all. In the real world you need more than this calculator can do so it may well be fine in an exam room but not in the workplace. Hypothesis testing on the other hand is catered for and very welcome. It is clear that his calculator has been targeted at the student and requirements for the exam room, the real world needs more than the simplified functionaily of this device. It will do for now but my search continues for something better.

After reading so many comments about counterfeit calculators, I got a bit panicked, then made some effort and validated authenticity of the one I purchased. It's a 100% authentic CASIO calculator, which passed verification check on CASIO website. To make sure you are using original product, I would recommend to scan the QR code and have it registered under your name, this way nobody else will use the code (they will be getting invalid code reading). Battery compartment and functional check done as show in the photos, all seems to be working well. Note: UK edition has a different packaging to the rest of the world, it doesn't indicate fake product. Also, after the registration, I have noticed this model was manufactured in Jan 2019, it passed its warranty period, not happy with that.

The CASIO FX-991EX is a sleek and powerful scientific calculator, perfect for students and professionals. With a wide range of functions, a user-friendly interface, and a slim design, it's both versatile and portable. The Natural Display feature and solar-powered operation enhance its appeal, making it a top choice for accurate and efficient calculations on the go. Highly recommended.

This calculator has more than enough options for GCSEs and a level maths along with a level physics. Many of these options I have yet to use but it’s good to have the choice. Much better than the newest model in my opinion.

i’ve had this for more than a year already but lasts for long and. i use it for my a levels. The level of complexity is very good. Buttons are easy to use and it has a great value of money. it’s also very easy to carry around.