Casio Scientific Calculator FX-991EX (552 Functions, Black / Pink / Blue, Solar Power)
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
Mini-Math Lessons – fx-991EX and Functions – QR Codes and All! – Blog: Strategies, Resources, & EdTech Tips