User's Guide, introduces the use of CASIO fx-115WA and fx-991WA calculators.
The Casio fx-991WA/115WA is a scientific calculator featuring a two-line display that allows users to simultaneously check calculation formulas and answers. The device includes various modes such as statistical, probability distribution, regression, complex number, and base-n calculations, along with functions for fractions, percentages, and trigonometry.
| Power Supply | Solar cell and a single G13 Type button battery (LR44) |
|---|---|
| Battery Life | Approximately 3 years (1 hour use per day) |
| Dimensions | 10(H) x76(W)x 150(D) mm |
| Weight | 85 g (30z) including battery |
| Operating Temperature | 0°C ~ 40°C (32°F ~ 104°F) |
The manual recommends replacing the battery at least once every three years to prevent leakage and memory corruption.
Low battery power can cause memory contents to become corrupted or lost completely.