What is the difference between Casio FX 570es and Casio FX 991es?
Hi,
There is none.
The 115ES, 991ES and 570ES all have exactly the same
fuctions.
Its only that in North America Casio prints "115ES"
In Europe Casio prints "991ES" on them.
And the rest of the world Casio prints "570ES"
Its just a way for casio to control prices in deifferent regions
of the world.
That's all.
If you look at the specifications of each model then you will
see that they are exactly the same.
CORRECTION:
991ES has solar power combined with battery power, while the
570ES has only battery power. Don't know about 115ES.