Key facts
- Brand
- Casio
- Model
- 991ES
- Category
- Office Equipment
- Industry
- Computers
- Documents
- 2
- Languages
- EN
- Last added
- 2012-06-06
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Casio FX-115ES PLUS/FX-991ES PLUS C User's Guide
User Manual 59 pages · 1.5 MB · EN
This document serves as a comprehensive user manual for the Casio FX-115ES PLUS and FX-991ES PLUS C calculators. It details how to initialize the device, turn power on and off, adjust display contrast, and navigate key markings. The guide explains various calculation modes including COMP, CMPLX, STAT, BASE-N, EQN, MATRIX, VECTOR, INEQ, VERIF, DIST, and TABLE.
Read onlineCasio 991ES specifications
| Battery Type (fx-991ES PLUS) | LR44 (GPA76) or R03 (UM-4) |
|---|---|
| Battery Type (fx-570ES PLUS) | R03 (UM-4) |
| Auto Power Off Time | 10 minutes |
All Casio 991ES documents by type
User Manual 2
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
What is the initial default calculation mode?
The initial default calculation mode is the COMP Mode.
How often should the battery be replaced?
You should replace the battery at least once every three years, even if operating normally.
How do I initialize the calculator to default settings?
Press (CLR), (ALPHA), and (&) then select Yes.
When should I replace the battery?
Replace it at least once every three years for fx-991ES PLUS or two years for fx-570ES PLUS.