Casio FX991EX

[Tugdual]

I was shopping in my local super market when I found a HP300s+ for a pretty modest price. I picked it and had mixed feelings. The concept is interesting, the screen very dark, the keys are also not very good. I was quick to find that this is actually a Casio (fx92 if I'm not mistaken) and hence got interested in the Casio fx991EX. It has been a long time I was looking for a decent non programmable calculator covering binary/hex, measurement unit conversions, quick functions calculation (like f(x)=...). I ordered a fx991EX and received it today but was not expecting much after the hp300s+. What a nice surprise, this Casio is really good! First impression is the casing is less bulky, lighter. Screen is much brighter, color choice on keyboard pleasant and easy to read. Keyboard is very responsive and enjoyable (much better than the hp).
I'm very impressed with this little gem which is modest but does everything very well. It covers basic matrices, complex numbers, function solver, binary/hex/octal/decimal, integration, derivative and many other features. It has a history buffer, Ans, error management (that let you fix the issueetc...) All very simple, very natural and pretty quick.
I compared speed and some features with the Hp50g which remains the queen, my best calc all time but the casio is pretty quick and is a very decent calc for the price. I would definitely recommend it over a 35s... I'm surprised to no see more praise and thought I would share my impression and I'm curious to know yours for those who know the product.