Casio fx-991ES PLUS (Natural V.P.A.M.)
The Casio fx-991ES PLUS 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:
You can download the Casio fx-991ES PLUS manual from this external link.
If you have a Casio fx-991ES PLUS that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement: