1. Introduction
This manual provides detailed instructions for the proper use and maintenance of your OSALO Scientific Calculator, model OS-82ES PLUS II. This calculator is designed for secondary school students and professionals, offering 252 functions, a 2-line display, and dual solar and battery power for reliable operation. Please read this manual thoroughly to ensure optimal performance and longevity of your device.
Figure 1: OSALO Scientific Calculator OS-82ES PLUS II. This image shows the calculator from an angled perspective, highlighting its black body, white keys, and the solar panel at the top. The display shows a complex mathematical integral.
2. Product Overview
Familiarize yourself with the various components and keys of your OSALO Scientific Calculator.
Figure 2: Key components of the OSALO Scientific Calculator. This diagram labels the solar panel, extra large display, control keys, SHIFT key, Mode key, Power on button, Function keys, Delete key, and Last answer key.
- Solar Panel: Provides power in well-lit environments.
- Extra Large Display: 2-line LCD for clear viewing of equations and results.
- Control Keys: Navigation and directional input.
- SHIFT Key: Accesses secondary functions printed above keys in yellow.
- ALPHA Key: Accesses alphabetic characters and variables printed above keys in red.
- Mode Key: Changes calculation modes (e.g., COMP, STAT, TABLE).
- ON Button: Powers on the calculator.
- Function Keys: Perform various mathematical and scientific operations.
- DEL (Delete) Key: Deletes the last entered character.
- AC (All Clear) Key: Clears all calculations and memory (except independent memory).
- ANS (Answer) Key: Recalls the result of the previous calculation.
3. Setup
3.1. Power Supply and Battery Installation
The OSALO Scientific Calculator is powered by both solar energy and an LR44 button cell battery. The battery is included and pre-installed.
- Ensure the calculator is turned off.
- Locate the battery compartment on the back of the calculator.
- Use a small screwdriver to open the battery compartment cover.
- If replacing, remove the old LR44 battery.
- Insert a new LR44 battery with the positive (+) side facing up.
- Replace the battery compartment cover and secure it with the screw.
Note: The solar panel provides supplementary power and extends battery life, but a functional battery is required for consistent operation, especially in low-light conditions.
3.2. Initial Power On
Press the ON button to turn on the calculator. The display will show "0" or the last calculated result.
3.3. Turning Off the Calculator
To turn off the calculator, press SHIFT then AC (OFF). The calculator will also automatically power off after a period of inactivity to conserve battery life.
4. Operating Instructions
4.1. Basic Calculations
Enter numbers and operators as you would write them. Press = to get the result.
- Addition: 1 + 2 =
- Subtraction: 5 - 3 =
- Multiplication: 4 × 6 =
- Division: 10 ÷ 2 =
4.2. 2-Line Display and Natural Input/Output
The calculator features a 2-line LCD display, allowing you to view both the input expression and the result simultaneously. It supports natural input and output, displaying fractions, roots, and other expressions as they appear in textbooks.
Figure 3: Examples of Natural Input & Output and Full-do Display. The image shows how complex fractions and roots are displayed in a natural, written form, and how statistical data can be viewed in a full-dot matrix display.
4.3. Using Scientific Functions (252 Functions)
The calculator provides 252 functions, including trigonometric, logarithmic, exponential, power, root, fraction, permutation, combination, and statistical calculations.
- Secondary Functions: Press SHIFT followed by the desired key to access the yellow-printed function above it.
- Alpha Functions: Press ALPHA followed by the desired key to access the red-printed character or variable above it.
- Trigonometric Functions: Use sin, cos, tan keys. Inverse functions are accessed via SHIFT.
- Logarithmic Functions: Use log (base 10) and ln (natural logarithm) keys.
- Fractions: Use the a b/c key to input and convert fractions.
- Statistics: Press MODE and select STAT mode. Refer to the calculator's on-screen menu for specific statistical calculations (e.g., standard deviation, linear regression).
- Memory Functions: Use STO (Store) and RCL (Recall) keys to store and retrieve values from independent memory.
4.4. Brightness Adjustment Function
The calculator features a brightness adjustment function to optimize display visibility and reduce visual fatigue.
Figure 4: Brightness Adjustment Function. This image illustrates the difference between a 'Dark' display setting (to relieve visual fatigue) and a 'Bright' setting (for clear and intuitive viewing), demonstrating the calculator's adjustable screen brightness.
To adjust brightness, navigate through the MODE settings or use specific key combinations as indicated in the on-screen menu.
5. Key Features
The OSALO Scientific Calculator OS-82ES PLUS II is equipped with several features designed to enhance usability and functionality for academic and professional use.
Figure 5: Overview of 252 Functions. This image highlights key capabilities such as Multi-replay function, Combination and Permutation, Statistics (STAT-data editor, Standard deviation, Regression analysis), Fraction Calculation, 9 variable memories, and the inclusion of a slide-on hard case.
- 252 Functions: Comprehensive set of mathematical, statistical, and scientific functions.
- 2-Line Large Display: Clear and simultaneous display of input and results, supporting natural textbook display.
- Sensitive Keys: Premium induction buttons provide quick and accurate response to input.
- Hard Sliding Cover: Ergonomically designed cover protects the calculator from damage and provides a comfortable grip.
- Dual Power (Solar & Battery): Ensures reliable operation in various lighting conditions.
- Multi-replay Function: Allows for quick review and editing of previous calculations.
- STAT-data Editor: Facilitates statistical calculations including standard deviation and regression analysis.
- 9 Variable Memories: Store and recall up to 9 different values for complex calculations.
Figure 6: Detail of LCD Display and Comfortable Keys. This image provides a close-up view of the calculator's clear LCD display and the tactile, responsive keys, emphasizing user comfort and readability.
6. Maintenance
6.1. Cleaning
- Wipe the calculator's exterior with a soft, dry cloth.
- For stubborn dirt, slightly dampen the cloth with water and a mild detergent, then wipe dry immediately.
- Do not use strong solvents, abrasive cleaners, or spray cleaners directly onto the calculator.
6.2. Storage
- Store the calculator in a cool, dry place, away from direct sunlight and extreme temperatures.
- Always use the provided hard sliding cover to protect the display and keys when not in use.
- Avoid placing heavy objects on the calculator.
6.3. Battery Replacement
When the display becomes dim or calculations are erratic, it may be time to replace the LR44 battery. Follow the instructions in Section 3.1. "Power Supply and Battery Installation". Dispose of used batteries according to local regulations.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Calculator does not turn on. | Low or dead battery; insufficient light for solar power. | Replace the LR44 battery. Ensure adequate lighting for solar panel. |
| Display is dim or blank. | Low battery; poor lighting; brightness setting too low. | Replace battery. Move to a brighter area. Adjust display brightness (refer to Section 4.4). |
| Incorrect calculation results. | Incorrect mode setting; syntax error; incorrect input. | Check the current mode (e.g., DEG/RAD, COMP/STAT). Review input for errors. Press AC to clear and restart. |
| Keys are unresponsive. | Calculator frozen; physical obstruction. | Try turning the calculator off and on again. Check for debris under keys. |
| "Math ERROR" or "Syntax ERROR" displayed. | Mathematical impossibility (e.g., division by zero); incorrect expression format. | Review your input for mathematical errors or incorrect syntax. Press AC to clear the error. |
8. Specifications
Figure 7: Calculator Dimensions and Weight. This image provides a side and front view of the calculator, indicating its approximate thickness (0.79 inches / 20mm), height (6.46 inches / 164mm), width (3.15 inches / 80mm), and net weight (4.9oz / 140g). Note that official specifications may vary slightly.
| Feature | Detail |
|---|---|
| Model | OS-82ES PLUS II |
| Brand | OSALO |
| Functions | 252 |
| Display Type | 2-line LCD, Natural Textbook Display |
| Screen Display Size | 6 Centimeters |
| Power Source | Solar & Battery Supply (LR44 x 1, included) |
| Material Type | Plastic |
| Product Dimensions | 16.4 x 8 x 0.1 cm (6.46 x 3.15 x 0.04 inches) |
| Item Weight | 190 g (approx. 6.7 oz) |
| Includes Rechargeable Battery | No |
9. Warranty and Support
For specific warranty information, please refer to the documentation provided at the time of purchase or contact your retailer. OSALO products are designed for reliability and performance.
If you encounter issues not covered in the troubleshooting section, or require further assistance, please contact OSALO customer support through their official website or the contact information provided with your product packaging.
