Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products
Got ahold of a Casio fx-991ex and CG-50 to match my Classpad II. I'm really impressed with them but there is something about the fx-991ex... (see comments) : r/calculators
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My FX-991EX seems to be stuck. It's not taking any inputs and not responding to reset button. : r/calculators
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