This manual describes the functions and operations of the fx-115ES and fx-991ES calculators.
This manual provides step‑by‑step instructions for using the Casio FX‑115ES/991ES calculator, including key functions, mode selection, and how to initialize the device. It also explains the display contrast adjustment, cursor keys, and the meaning of on‑screen indicators.
Safety precautions, battery replacement, and disposal guidelines are detailed, along with the calculator’s physical specifications such as dimensions, weight, power source, and operating temperature range. This manual is written in Spanish.
| Battery type | Tipo G13 (LR44) x 1 |
|---|---|
| Battery life | Aproximadamente 3 años |
| Operating temperature | 0 °C to 40 °C |
| Dimensions (W × H × D) | 12.2 mm × 80 mm × 161 mm |
| Weight | ≈105 g with battery |
| Included items | Hard case |
Remove the old battery, insert a new G13 (LR44) battery, and ensure the positive and negative contacts are correctly aligned.
The calculator can be used between 0 °C and 40 °C.
Slide the hard case down to remove it, then press the ON key to activate the calculator.