3.03 in 0.44 in  | 3.07 in 0.5 in  | |
| Available colors | ||
| User rating |
 Casio FX-991EX |  Casio FX-991MS | |
|---|---|---|
| Type | Scientific calculator | Scientific calculator |
| Casio FX-991EX | Casio FX-991MS | |
|---|---|---|
| Colour of product |
| Grey |
| Form factor | ||
| Cover | no | yes |
| Casio FX-991EX | Casio FX-991MS | |
|---|---|---|
| Width | 3.03 in | 3.07 in |
| Height | 0.44 in | 0.5 in |
| Depth | 6.52 in | 6.08 in |
| Weight | 3.17 oz | 3.7 oz |
| Casio FX-991EX | Casio FX-991MS | |
|---|---|---|
| Number of characters per line | 16 | 10 |
| Number of display lines | 2 | 2 |
| Display tilting | no | no |
| Second display | no | no |
| Display light | no | no |
| Casio FX-991EX | Casio FX-991MS | |
|---|---|---|
| Complex functions | yes | yes |
| Statistical functions | yes | yes |
| Casio FX-991EX | Casio FX-991MS | |
|---|---|---|
| Power source |
|
|
| Battery operated | yes | yes |
| External power connection |
| Solar cell |
| Pros | ||
|---|---|---|
| Cons |
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