1. Product Overview
The Casio DM-1200BM is a 12-digit desktop calculator designed for business, office, and finance use. It features an extra-large display for enhanced readability, dedicated keys for Cost/Sell/Margin calculations, and tax functions. Its dual power source (solar and battery) ensures reliable operation in various lighting conditions.
Figure 1: Front view of the Casio DM-1200BM Business Desktop Calculator, showcasing its large display and key layout.
2. Key Features
- Extra-Large 12-Digit Display: Provides clear and easy-to-read numbers, reducing eye strain.
- Cost/Sell/Margin Keys: Dedicated buttons for quick and accurate profit margin calculations.
- Tax Calculation Functions: Simplifies adding or subtracting tax values.
- Kickstand Design: Built-in angled display stand for optimal viewing and ergonomic comfort.
- Solar + Battery Power: Operates using solar energy with a battery backup for consistent performance.
3. Setup
3.1 Power Source
The Casio DM-1200BM calculator utilizes a dual power system: solar power and a single LR44 battery (included). For optimal performance, ensure the calculator is exposed to sufficient light for solar operation. The battery provides backup power in low-light conditions.
- Initial Use: The calculator is ready for use out of the box. No specific battery installation is required for initial setup as the LR44 battery is pre-installed.
- Battery Replacement: If the display becomes dim or unresponsive in low light, the LR44 battery may need replacement. Refer to the 'Maintenance' section for instructions on replacing the battery.
3.2 Kickstand Adjustment
To adjust the viewing angle, locate the kickstand on the underside of the calculator. Gently pull it out to prop up the display. Push it back in to lay the calculator flat.
4. Operating Instructions
4.1 Basic Calculations
Perform standard arithmetic operations using the number keys (0-9, 00, .), and operation keys (+, -, ×, ÷, =).
- Press ON/AC to clear the display and start a new calculation.
- Press C to clear the last entry.
4.2 Cost/Sell/Margin (CSM) Functions
These functions allow for quick calculation of Cost, Selling Price, and Profit Margin when two of the three values are known.
Figure 2: Example calculations for Cost, Sell, and Margin functions as illustrated on the product packaging.
- To find Selling Price: Enter Cost, press COST, enter Margin (as a percentage), press MAR, then press SELL.
- To find Cost: Enter Selling Price, press SELL, enter Margin (as a percentage), press MAR, then press COST.
- To find Margin: Enter Cost, press COST, enter Selling Price, press SELL, then press MAR.
4.3 Tax Calculation Functions
The calculator includes dedicated keys for tax calculations. Before using, set the tax rate.
- Setting Tax Rate: Press RATE SET %, enter the tax rate (e.g., 5 for 5%), then press RATE SET % again.
- Adding Tax: Enter the amount, then press TAX+.
- Subtracting Tax: Enter the amount, then press TAX-.
4.4 Memory Functions
Store and recall values using the memory keys.
- M+: Adds the displayed value to memory.
- M-: Subtracts the displayed value from memory.
- MR: Recalls the memory value to the display.
- MC: Clears the memory.
4.5 Display Settings
The calculator features a slide switch for decimal point and rounding settings.
- F CUT 5/4: Controls decimal places and rounding.
- F: Floating decimal point.
- CUT: Truncates decimal places.
- 5/4: Rounds up if the next digit is 5 or greater.
- 4 3 2 1 0 ADD2: Sets the number of decimal places (0-4) or adds 2 decimal places automatically (ADD2).
5. Maintenance
Proper care ensures the longevity of your calculator.
- Cleaning: Wipe the calculator with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Replacement: To replace the LR44 battery, carefully open the battery compartment on the back of the unit. Insert a new LR44 battery with the correct polarity (+/-). Dispose of old batteries responsibly.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Insufficient light for solar power, or low battery. | Move to a well-lit area. If problem persists, replace the LR44 battery. |
| Incorrect calculation results. | Incorrect input, or incorrect decimal/rounding settings. | Clear the calculator (ON/AC) and re-enter the calculation. Check the slide switch settings for decimal places. |
| Keys are unresponsive. | Temporary malfunction or low power. | Press ON/AC. Ensure adequate light. If unresponsive, try replacing the battery. |
7. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 10.32 x 7.87 x 1.65 inches |
| Item Weight | 12 ounces |
| Model Number | DM-1200BM |
| Batteries | 1 LR44 batteries required (included) |
| Brand | Casio |
| Color | Silver |
| Calculator Type | Business |
| Power Source | Solar Powered |
| Screen Size | 5.0 inches |
| Manufacturer | Casio Inc. |
| First Available Date | March 1, 2015 |
8. Warranty and Support
For warranty information and customer support, please refer to the official Casio website or contact Casio customer service directly. The product typically comes with a standard manufacturer's warranty covering defects in materials and workmanship.
You can visit the official Casio store for more information: Casio Store
For product-specific inquiries, please reference the model number DM-1200BM.
9. Legal Disclaimer
This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
