Complete calculator 36 which provide from basic calculator 36 to advanced calculator 30 includes: math, equation solver, system of equation solvers, .... The display displays expression as same as it written in text book. The calculator 36 x pro supports more than 12 digits, unlimited number of digits.
There are some scientific features:

The most power scientific calculator 36 pro supports matrix and vector calculation, math, number, sin cos tan

Advanced calculator 36 provides set of advanced features for engineering students such as equation solver, integral, integer, derivative, system equations solver, prime factor.

Engineering calculator 36 is a useful instruments for students. This calculator is designed same as calculator 30, calculator 36 pro x, calculator 84

Smart scientific calculator contains statistics, regression, hypothesis.

The 991 es plus emulator: the set of math functions is same as calculator 991 ex, 300 es plus and even the calculator 115 es plus.
With this calculator, you do not need to buy a calc 36 or calc 30 because it is design for users used calc 30, 36