The Casio fx-570ES and fx-991ES
The casio fx-570ES is a beautifully made scientific calculator, identical with the fx-991ES, except that this model is powered by a small AAA torch battery, while the 991ES has a solar cell assisted by a small button size LR44 battery, much cheaper than the lithium cells used by Casio in the past.
Both models have 403 functions,including permutations and combinations, bi-variate regression, "solve" and "calc" functions for any equation, 3 simultaneous equations and matrices. In fact they are the most advanced scientific calculators currently in the Casio range, except for the graphic range which are much larger, complicated to operate and therefore slower. The key action is perfect as we have come to expect from Casio and the lettering for the secondary functions is black and brown on brushed aluminium back ground, rather than that aweful yellow, and red lettering on black background use by Casio in the past, which was so difficult to read in artificial light at home.
But perfect though these two models are in what they do, they have one great deficiency which prevents me from giving them an "excellent" rating: they are not programmable. This clearly indicates that they were designed for school and college work, rather than serious scientific or professional work. A great pity.
This is a beautifully made scientific calculator with 403 functions,including regression analysis with 2 variables, permutations &combinations, solve and calc for 3 simultaneous equations and matrices. The key action is perfect, as we have come to expect from Casio and the lettering is black on white and not that awful yellow and red on black, favourite of Casio, but terrible to read at home at night.
This model is identical with the FX-991ES, except that it is powered by a single,AAA inexpensive torch battery, while the other has a solar cell and a small button alkaline battery. Both should have negligible running costs.
But near perfect though these two models are in what they do, they have one great disadvantage which prevents me from giving them an "excellent" rating: They are not programmable, which means they were really designed for school and college work and not for serious scientific work. A great pity.
1 of 1 people found this review helpful.
Very Good Calculator
Great Calculator, easy to use, would reccomend to anyone who needs it for their GCSE year etc. Not that much more expensive compared to its other cheaper version, would say if you are getting another version for a cheaper price, consider this too as it has a lot more features for not that much extra