(Secretely, I want a SwissMicro dm42, but they're just too expensive. The fx-991ex is a very cool calculator and I'm keeping it to show off to family and friends, but I got myself a replacement fx-260 for everyday use. Casio FX-991CW Advanced Scientific LCD Display. And the whole menu system - who uses a calculator for spreadsheets or matrix calculations? Come on. Casio FX991EX Classwiz Advance Engineering Scientific Calculator Tested Works A+. The fx-991CW ClassWiz is the latest enhancement to the scientific calculator. The display is pretty and I like how the entered formula remains on display together with the answer - but it's cumbersome: expressions used in everyday math and science require more clicks than with the "immediate entry" method. All the mark-up capabilities of an adding machine for simplified cost and profit calculations. Black coloured calculator, designed and engineered for easy operation. But more importantly, (5) I find that I don't like its main attraction, the V.P.A.M. Casio FX-991ES Plus Scientific Calculator. Higher resolution increases the amount of information that can be displayed and improves usability. First, my minor gripes: (1) It's too big I love the pocketable size of the fx-260 (2) the keys feel like chiclets and make a rattling sound when pressed (3) the mottled surface texture makes the alternate key labels hard to read, especially the blue ones - practically impossible except in very bright light - what were they thinking? (4) The slide-on cover is too loose-fitting, slips off by itself. CASIO FX-991EX CLASSWIZ ADVANCED SCIENTIFIC CALCULATOR. This calculator has a comprehensive set of advanced calculations for integration and differential calculus along with vector and inequality calculations. One of the keys on my trusty old fx-260 had become erratic (it's over 20 years old, so I can't complain) and I decided to upgrade to the state-of-the-art fx-991ex. With a high-resolution LCD screen, the fx-991EX allows for more information to be displayed for applications like spreadsheets and 4x4 matrix calculations.
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