Introduction
The Casio MS-100EM is a versatile 10-digit desktop calculator designed for various calculations, from basic arithmetic to complex business functions. It features currency conversion, professional percentage calculation, and cost/sell/margin analysis. This manual provides detailed instructions for setting up, operating, and maintaining your calculator to ensure optimal performance.
Image: Front view of the Casio MS-100EM desktop calculator, displaying its 10-digit screen and key arrangement. The calculator has a blue aluminum front and dark blue keys.
1. Setup
1.1 Power Source
The Casio MS-100EM calculator operates using both solar power and a battery. The solar panel provides power in well-lit environments, while the included 12V alkaline battery ensures continuous operation in low light or when solar power is insufficient. The calculator is designed to automatically switch between power sources as needed.
1.2 Initial Use and Automatic Shut-off
Upon first use, ensure adequate lighting for the solar panel or that the battery is correctly installed. The calculator will automatically power off after approximately 6 minutes of inactivity to conserve battery life. Press any key to reactivate the device.
1.3 Memory Protection Battery
The calculator includes a memory protection battery. This feature ensures that stored data, such as currency rates or tax rates, are retained even when the main power source is depleted or during battery replacement.
2. Operating Instructions
2.1 Basic Calculations
Perform standard arithmetic operations (addition, subtraction, multiplication, division) using the numeric keypad and corresponding function keys. The 10-digit LCD display shows your entries and results. The calculator features an input buffer to prevent missed entries during rapid key presses.
2.2 Currency Conversion
- Setting the Exchange Rate: Enter the desired exchange rate (e.g., 1.25 for 1 unit of local currency = 1.25 units of foreign currency). Press the SET % key, then the RATE key. The rate is now stored.
- Converting Currency: Enter the amount in the original currency. Press the Local key to convert to the stored foreign currency, or the Euro key (if applicable) to convert to Euro based on a pre-set rate.
2.3 Professional Percentage Calculation
To calculate percentages, enter the base value, then the multiplication or division operator, followed by the percentage value, and finally the % key. For example, to calculate 15% of 200: 200 x 15 %. The calculator can also determine percentage increases and decreases, displaying the calculated value separately.
2.4 Cost, Sell, Margin (CSM) Calculation
The profit calculation function allows you to determine costs, selling prices, and profit margins. Use the COST, SELL, and MAR (Margin) keys. Enter two of the three values, then press the key for the unknown value to calculate it.
2.5 Mark Up with Percentage Key
This function quickly determines margins and markups in commercial applications. Enter the cost, then press +, then the desired markup percentage, and finally the % key to see the selling price.
2.6 Memory Functions
The calculator features a 3-key memory system (M+, M-, MRC) to store and recall values for later use. M+ adds the displayed value to memory, M- subtracts it, and MRC recalls the memory content (press twice to clear memory).
2.7 Correction and Sign Change
- Quick Correction Button (C): Deletes the current entry in numerals without clearing the entire calculation.
- All Clear (AC): Clears all entries and calculations.
- Sign Change (+/-): Changes the sign of the displayed number (e.g., from 100 to -100 or vice versa).
2.8 Display Features
- Calculation Command Display: The arithmetic operator currently in use (e.g., +, -, x, ÷) is displayed as a symbol on the screen.
- Thousands Division: For improved readability, a comma or space visually separates thousands after every three digits.
3. Maintenance
3.1 Cleaning
To clean the calculator, gently wipe the surface with a soft, dry cloth. For stubborn dirt, a slightly damp cloth with mild soap can be used, ensuring no liquid enters the device. Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the display or casing.
3.2 Battery Replacement
When the display becomes dim or unresponsive in low light conditions, it may be time to replace the battery. The calculator uses one 12V alkaline battery. Refer to the battery compartment on the back of the device for specific instructions on how to open and replace the battery. Ensure proper polarity. The memory protection battery helps retain stored data during this process.
3.3 Storage
Store the calculator in a cool, dry place away from direct sunlight, extreme temperatures, and high humidity. Prolonged exposure to these conditions can affect performance and battery life.
4. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Insufficient light for solar power; low battery. | Move to a brighter area or replace the battery. |
| Calculator turns off unexpectedly. | Automatic shut-off activated due to inactivity. | This is normal operation. Press any key to turn it back on. |
| Incorrect calculation results. | Incorrect key input; memory not cleared. | Double-check your entries. Press AC to clear all calculations and memory before starting a new one. |
| Currency conversion not working. | Exchange rate not set or incorrectly set. | Re-enter and save the correct exchange rate as per section 2.2. |
5. Specifications
| Feature | Detail |
|---|---|
| Brand | Casio |
| Model | MS-100EM |
| Display | 10-digit LCD, 7.9 cm standing screen display size, with calculation command display and thousands division |
| Power Source | Solar / Battery Operated (1 x 12V Alkaline battery included) |
| Automatic Shut-off | Yes (after 6 minutes of inactivity) |
| Memory | 3-key memory, Memory protection battery |
| Special Features | Currency conversion (1 rate), Professional percentage calculation, Cost/Sell/Margin, Mark Up, Quick correction button, Sign change, Input buffer |
| Material | Plastic with Aluminium front |
| Dimensions (L x W x H) | 14.9 x 10.1 x 2.8 cm |
| Weight | 120 g |
| Color | Blue |
| Country/Region of Origin | Germany |
Image: Dimensions of the Casio MS-100EM calculator, illustrating its physical size for reference.
6. Warranty and Support
For warranty information and customer support, please refer to the documentation included with your purchase or visit the official Casio website. Casio provides support for its products to ensure customer satisfaction.
You can find more information and contact details on the Casio Store on Amazon.
