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

I'm so happy with the calculator I purchased over a year ago; it has been a true workhorse. The display is still crystal clear, and the keys haven't faded or stuck, despite frequent use. The battery life has also been surprisingly good, and I haven't needed to replace it yet. I would absolutely recommend this calculator to anyone looking for a reliable and long-lasting tool. It's a great investment, and I'm very satisfied with my purchase.

Used this for Alevel maths. Easy to use.

Perfect for school, works very well

Does the job for GCSE and A-level Maths, in style. Looks good and works well. It has dual-battery (solar and cell) so it will probably last years before needing to change the battery. There are lots of functions that enable you to solve problems that others have to do manually, such as solving for x in an equation. It can convert between denary, binary and hexadecimal, useful in Computer Science but a shame that calculators aren't allowed in CS exams! Had to look in the (very useful) manual to find out the functions of some features.However, a small gripe is that it's missing the "recurring" symbol, for example when you want to write 1/3 as a decimal but you have to input 0.33333 and so on rather than 0.3*. Other Casio calculators have this, including my older fx-83gt plus. Not sure why this wasn't implemented in this model.Everything else is otherwise perfect. Durable hard cover, clear display and aesthetic design. Recommended for students in exam years.

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.

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.

If you need an accurate and useful calculator for work or school, then this is the one to get! There are a couple of lines so you can see & check your calculations for typos. It is solar powered as well so you don't need to keep on changing batteries. The display is clear and easy to read. The cover protects the buttons & display. When calculating large numbers, it is accurate whereas other calculators would round off too early. The calculator itself is durable and with last years. I have a 13 year old model Casio which I am still using and bought this one for a colleague.