Casio fx-991CW (ClassWiz)
The Casio fx-991CW is a scientific calculator with 10 digits precision and formula input logic. It has 540 functions, 48 keys, and an LCD (liquid crystal) display. The power source is Solar + LR44 cell. The calculator was manufactured in China. Note: Can be paired with a smartphone or tablet for graphic display.
Facts at a glance:
| Feature | Value |
|---|---|
| Type | Scientific |
| Functions | 540 |
| Keys | 48 |
| Precision | 10 |
| Logic | Formula |
| Display type | LCD |
| Display size | 192 |
| Length | 162mm |
| Width | 77mm |
| Thickness | 11mm |
| Weight | 90g |
| Power Source | Solar + LR44 cell |
| Country | China |
| Original price | $22 |
| Year introduced | 2023 |
| Current price | amazon.com |
User Manual
You can download the Casio fx-991CW manual from the manuals website.
Diagnostics
Note that diagnostic tests generally delete any data on the calculator. Be sure to back up any important information held in the calculator before running these tests.
While holding down Shift and 7 keys, press ON (displays DIAGNOSTIC), release keys, then 6. Then choose from menu.
Replacements:
If you have a Casio fx-991CW that is no longer working, it's probably easiest to just buy a new one, as this model is still currently available.