This CASIO fx-991es plus calculator has all the advanced calculating functions. Such as: cos, tan, RCL, ENG, CALC, parentheses, multi-view scrolling, graphing, M+, sin, (-), ln, log, x^x, and many many more. 40 metric conversions and 40 scientific constants are also available.
Fx-991ES (Natural Display) The Casio fx-991ES is a scientific calculator with 8 digits precision and formula input logic. It has 403 functions, 50 keys, and an LCD (liquid crystal) display. The power source is Solar. The calculator was manufactured in China. Note: Functionally the same as fx-570ES with solar power Facts at a glance: Feature Value Type: Scientific Functions: 403 Keys: 50 Precision: 8 Logic: Formula Display type: LCD Length: 161mm Width: 80mm Thickness: 12mm Weight: 105g Power Source: Solar Country: China Year introduced: 2005 See.