Casio fx-991EX vs fx-991MS speed, accuracy comparison - YouTube
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What is the difference between the Casio FX‑991ES and 991ex? Which one should I prefer for my VTU exams? - Quora
Casio FX82 calculator I bought in 1982 at the age of 15. Used it throughout school, my apprenticeship and work as a draughtsman. Don't use it much now but it still works