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
Which Casio calculator is better, FX-991EX or FX-991MS, and why? - Quora
آلة حاسبة كاسيو 552 عملية Casio calculator fx-991EX-PK 552 Functions - لبيتك LBETK