This manual introduces the Casio FX-991ES scientific calculator, covering initial setup, key notation, and example problems. It explains how to attach and remove the hard case, and how to reset the device to its initial state.
Safety precautions, battery handling, and proper care are detailed to ensure reliable operation. The guide also describes how to change display modes, angle settings, and provides maintenance advice such as cleaning and storage. This manual is written in Japanese.
| Battery type | LR44 (3 years) |
|---|
Press the (6) key before first use.