Casio FX-991ES Scientific Calculator

The calculator is excellent, and I got it for only £8.51. I find it easy to use and it handles everything I can throw at it. It is also good for the environment - an important feature to consider when purchasing anything, as it has solar panels.

For all people doing A levels make sure you get one this i a very good calculator and no point making the exams harder for yourself

This calculator is very easy to undertand and use. It covers all aspects used in my sons school. Great value for money - much better than when I had one for my schooling !! years ago!

This was a gift for my husband, he already owns one, but was worried sick incase it got lost or damaged, so now he has a spare, it's the only model he has found that can cope with the complexities of the maths he's doing at the moment. Excellent machine for higher education courses.

It`s a gift to my son,he is finding the calculator superb.He is a student in University(Electrical engineering)

The calc is great, better than originals and quite cheap too, you won't understand how good it is until your using it for further maths. however i only bought it because i lost my mates!

Good servies, fast delivery, Many thanx________________
Good servies, fast delivery, Many thanx________________
Good servies, fast delivery, Many thanx________________
Good servies, fast delivery, Many thanx________________

I have bought the calculator so that i can use it for my orindary level exams and later for the advanced maths. I like its features and its large display which could show the fractions (for example) with the numbers on top of each other. The only two things i don't really like are that there are two less variables than other calculators by Casio and that the manual is on a large sheet not a booklet. I still like the calculator very much and would still give it an excellent rating. Also, the constants and conversions could be utilised. All in all, I'm really happy with my casio fx-991ES as it makes my life easier drawing tables and solving equations etc!

Ho acquistato il calcolatore per mio figlio di 15 anni che lo utilizza per il liceo scientifico . Rispetto a prodotti similari acquistabili nei negozi in Italia c'è stato un risparmio pari al 70 % circa (comprese le spese di spedizione).
Il calcolatore funziona benissimo .
Inolter sul sito della Casio è possibile scaricare le istruzioni d'uso in qualsiasi lingua .

This is a good basic scientific calculator, very easy to use. Bought it to help me with my exam. The only reason i rated it as good is that user guide is printed on a big folded sheet of paper, would have been more useful if it was in a book format.

This was purchased for my 13 yr old son who is very pleased with the calculator, who uses it for school; it can do so much more than the standard scientific ones, it appears, as I have to go on what he says!
Well worth the money

I love this calculator, the range of functions is endless and it is so easy to use. It will have truly saved my maths exam marks. If your worried that this is not allowed by exam boards, it is!

This model, together with the FX-570ES, are the most advanced scientific calculators in the current Casio range. The two models are identical, except that this one is powered by a solar cell and a small LR44 button battery, while the other requires an ordinary, cheap, AA torch battery, which I think is preferable. At last calculator manufacturers seem to have realised that lithium batteries, at retail prices, eventually cost more than their calculators.

Another great improvement from earlier models is the keyboard base, which is now silver and so far easier to read in any lighting, than the previous Casio favourite, that awful black, which was impossible to read at home at night. The key action is very good, soft with a slight click, as we have come to expect from Casio, but I would still prefer it slightly softer, as in some earlier models, for faster operation. The calculating facilities it offers are excellent: 403 functions, including solve, calc, 3 simultaneous equations, matrices, bivariate regression etc, plus the dubious benefit of 40 constants.
The finish and workmanship are first class.

But excellent though this model is in all the above, it does have some disadvantages compared with previous models, which prevent me from giving it an "excellent" overall rating. The main one is that it has no programmability at all and so it is more suitable for schools and collages, rather than for serious professional or scientific work. -The grafic models are not the answer as they are big and heavy, difficult to learn and much slower to operate-. Another shortcominbg is that it omly has 7 memories, and storing numbers into them is clumsy and slow, requiring 3 key strokes on distant keys, instead of the usual 2. So does fixing the number of decimal points. Its logic with memories is also less efficient than previously. It is a pity that manufacturers so often take 2 steps forward and 1 step backwards. I hope one day Casio will correct these shortcomings and they will then have a world beater. My rating is: "Very good"