Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"
Casio Scientific Calculator - Shop School & Office Supplies at H-E-B
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