The advanced graphing calculator from CASIO is now more advanced. In addition to the features and functionality you've always loved in the 9860G, there are several enhancements in the GII model that will be sure to please. The fx-9860GII allows for powerful, quick calculations - comparable with the TI-84 Plus and TI-84 Plus Silver Edition. 9860 GII FUNCTIONALITY: REF/RREF Function, Random Integers, Unit Conversion, New types of regressions, Chi-squared GOF function, 9 new probability functions, Pie charts & Bar Graphs, Graph X=f(Y), And much more!