Graph calculator I used

During SAT math 2 study, I definitely felt the need of graph calculator so I bought me a graph calculator about 2019. In fact, in this time I studied my SAT study in tandem with my calculus study. I can do triple integral. Actually, As studying physics, I liked finding relationship between position and velocity and between velocity and acceleration.

However, I need new graph calculator on account of a problem of the graph calculator.