FX-991WA - Calculator CASIO - Free user manual and instructions
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| Product Type | Scientific Calculator |
| Brand | Casio |
| Model | FX-991WA |
| Functions | 240 (including trigonometric, logarithmic, statistical, etc.) |
| Display | 2-line LCD, 96 x 32 dots |
| Power Source | Solar cell + LR44 battery |
| Auto Power Off | Yes, after 6 minutes of inactivity |
| Dimensions (approx.) | 16.2 x 8.2 x 1.5 cm (6.4 x 3.2 x 0.6 in) |
| Weight (approx.) | 100 g (3.5 oz) including battery |
| Battery Type | LR44 (1.5V) |
| Battery Life | Approximately 2 years under normal use |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Memory | 7 variable memories (M, A-F) |
| Fraction Calculations | Yes, including simplified fractions |
| Statistical Functions | Mean, standard deviation, linear regression |
| Base Conversions | BIN, OCT, HEX, DEC |
| Matrix/Vector Support | No (only basic arithmetic) |
| Cover | Hard sliding cover included |
| Cleaning | Wipe with a soft dry cloth; avoid solvents |
| Safety | Do not expose to extreme temperatures or moisture |
| Spare Parts | Battery (LR44) is replaceable; contact Casio support |
| General Information | Designed for school and college mathematics |
Frequently Asked Questions - FX-991WA CASIO
How do I turn on the FX-991WA?
Press the ON button. The calculator will turn on. If it does not, check the battery or solar cell is not blocked.
How to adjust the contrast?
Press SHIFT then SETUP (MODE SETUP). Choose 3: Contrast. Use the arrow keys to adjust, then press EXE or ON.
What type of battery does it use?
It uses one LR44 alkaline button cell. Replace when the display becomes dim.
How to reset the calculator?
Press SHIFT 9 (CLR), then choose 1: Setup or 2: Memory. Press EXE then AC to confirm.
Does it have a memory function?
Yes, it has seven data memories: M and A-F. Use SHIFT STO to store, RCL to recall.
How to solve quadratic equations?
The FX-991WA does not have a built-in equation solver. Use the quadratic formula manually.
How to perform statistical calculations?
Press MODE then 3: STAT. Choose the type (1-variable, linear regression). Enter data with =. Press SHIFT STAT to view results.
How to convert between degrees and radians?
Press SHIFT SETUP (MODE SETUP), then choose 1: Deg or 2: Rad. Press EXE.
Why is there no sunlight? What to do?
The calculator also runs on battery. If the screen is blank, check the battery orientation and replace if needed.
How to clean the calculator?
Use a soft dry cloth to wipe the surface. Do not use water, solvents, or abrasive cleaners.
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