Scientific Calculator Casio FX-87DE X Pocket Black

The Casio FX-87DE X Pocket Black is a compact scientific calculator designed for everyday academic and professional use. It combines a dual power source—solar panel with battery backup—with a protective slide-on cover and a compact form factor that fits easily into a pocket or notebook pouch. The device provides a broad selection of built-in mathematical and scientific functions suitable for classroom examinations and routine technical calculations.

Advantages

The calculator offers a reliable dual power system that reduces the risk of unexpected power loss during use. Its compact pocket-sized design and protective cover enhance portability and durability. The keyboard layout is arranged for efficient input of formulas and functions, while the display supports clear visualization of expressions. A wide function set covers algebraic, trigonometric, statistical, and fractional operations, enabling precise results for complex calculations.

Suitable for

• High school and university mathematics classes
• Science and engineering problem solving
• Statistical data analysis and basic probability calculations
• Examination use where approved
• Everyday technical and financial calculations

Key specifications

• Power: dual power (solar with battery backup)
• Form factor: pocket-sized with protective slide-on cover
• Functionality: scientific functions including algebraic, trigonometric, logarithmic, exponential, fractions and statistical calculations
• Display: multi-line display for clear expression and result viewing
• Keyboard: tactile keys arranged for straightforward entry of mathematical expressions
• Construction: lightweight housing with durable plastic finish

How to use

Turn the calculator on using the power key or slide off the protective cover to access the keyboard. Enter numerical values and select functions using the labeled keys; multi-step expressions can be input sequentially with use of parentheses and the expression-editing keys. For statistical or fraction operations, select the appropriate mode from the mode menu and follow on-screen prompts for data entry. When not in use, slide the protective cover back on to protect the display and keys. Replace the battery as recommended by the manufacturer when display dimming indicates reduced backup power.

Recommendations

Use the Casio FX-87DE X in well-lit environments to maximize solar charging efficiency and store it in a protective case when carrying it in a bag. Clean the housing and keys with a soft, dry cloth; avoid liquids and abrasive cleaners. Before examinations, verify that the model is permitted under exam rules and ensure the battery level is adequate for uninterrupted use.