Casio Scientific Calculator FX-991ES Plus

Two-way power (Solar + Battery)

Solar powered when light is sufficient, battery powered when light is insufficient.

Designed and engineered for easy operation.

Display expression same as textbook.

Viewing and editing of input data in list format, showing data groups (x-data, y-data, frequency) and surrounding data.

Quick and easy recall of previously executed formulas for editing and re-execution.

10-digit mantissa + 2-digit exponential display.

High-resolution screen provides beautiful looking graphs every time.

Functions:

New equation mode

Random integers

Fraction calculations

Combination and permutation

Statistics (List-based STAT data editor, standard deviation, regression analysis)

9 variables

Table function

Comes with new slide-on hard case