3.15 in 6.38 in  | 3.15 in 0.48 in  | |
| Available colors | ||
| User rating |
 Casio FX-991DE Plus |  Casio FX-991ES | |
|---|---|---|
| Type | Scientific calculator | Scientific calculator |
| Casio FX-991DE Plus | Casio FX-991ES | |
|---|---|---|
| Colour of product |
|
|
| Control type | Buttons | Buttons |
| Form factor |
| Casio FX-991DE Plus | Casio FX-991ES | |
|---|---|---|
| Width | 3.15 in | 3.15 in |
| Height | 6.38 in | 0.48 in |
| Depth | 0.44 in | 6.34 in |
| Weight | 3.35 oz | 3.7 oz |
| Casio FX-991DE Plus | Casio FX-991ES | |
|---|---|---|
| Number of characters per line | 12 | 12 |
| Display type | Dot-matrix | Dot-matrix |
| Display tilting | no | no |
| Second display | no | no |
| Display light | yes | no |
| Casio FX-991DE Plus | Casio FX-991ES | |
|---|---|---|
| Power source |
|
|
| Battery operated | yes | yes |
| External power connection | Solar cell | Solar cell |
| Pros | ||
|---|---|---|
| Cons |
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