Found this incredible function on my Fx991EX if you press shift and Option button on left corner it creates a QR code that can be scanned with a phone to see graphing
fx-991EX | Black Scientific Calculator | CASIO
SOLVED: How to draw graphs on casio fx-991ex - Fixya
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ZheElen FX-991ES-PLUS Calculator 417 Functions High School University Calculation Tool Computer Office Two Ways Power Graphing - Walmart.ca
Casio Standard Scientific Calculators, Non-Programmable, Non-Graphing, 10 + 2 Digits, 3-Digit Comma Markers, Plastic Keys, Solar & Battery Power Supply, Black | Fx-991Ex Buy, Best Price in Russia, Moscow, Saint Petersburg
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
fx991EX Functions, Tables, Regressions and Visualization with QR Code Mini-Math Lesson) - YouTube
Casio fx-9750GIII Black Graphing Calculator & FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" in Dubai - UAE | Whizz Scientific
Casio FX-9750GA Plus Graphing Calculator (Used)
Which calculator from other brands is the most similar to the Casio FX-991EX? - Quora