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
Casio FX-991EX Engineering/Scientific Calculator - Black | Calulators | Office Zone
Which calculator from other brands is the most similar to the Casio FX-991EX? - Quora
Statistics on Casio fx-991EX Classwiz (Non Programmable Scientific Calculator) | Do you statistics in #Original #Casio #Calculator. Buy with 1-year of #Warranty | By Casio Calculators Nepal | Facebook