CBSSIO Scientific Digital Calculator CS-991ES Plus

Product Name: CBSSIO Scientific Digital Calculator CS-991ES Plus

Product SKU: 101791

Product Weight: 125 g

Product Description

The CBSSIO CS-991ES Plus is a powerful, feature-rich scientific calculator engineered for academic and professional excellence. With 417 built-in functions, Natural Textbook Display (V.P.A.M.), and intuitive menu navigation, it replicates the performance of premium calculators at an accessible price. Ideal for STEM students, engineers, architects, and scientists, this calculator handles complex calculations—including matrix operations, vector algebra, statistical regression, integration, differentiation, and base-N arithmetic—with precision and speed. Its dual power system (solar + battery) ensures reliability in any lighting condition.

Features:

• 417 Advanced Functions: Covers all standard and advanced scientific needs
• Natural Textbook Display (V.P.A.M.): Shows expressions exactly as they appear in textbooks (fractions, roots, integrals, etc.)
• Multi-Line Display: 2-line LCD (10+2 digits) — view input and result simultaneously
• Dual Power System: Solar cell + LR44 button battery (included) — works in low light
• Intuitive Menu Navigation: Dedicated MODE, SHIFT, ALPHA, and circular REPLAY key for easy access
• Comprehensive Math & Science Support:
  • Complex numbers, matrices (up to 4×4), vectors
  • Statistics (1-Var, 2-Var, regression, distribution)
  • Calculus (numerical derivative & integral)
  • Equation solving (simultaneous, polynomial up to degree 4)
  • Base-N calculations (BIN, OCT, DEC, HEX)
  • Unit conversions & constants (40 built-in)
• Hard Protective Case: Included for safe storage and transport
• Ergonomic Layout: Well-spaced keys with tactile feedback; non-slip rubber feet
• Ideal For: GCSE/A-Level, IB, AP, university STEM courses, engineering exams, competitive tests
• Great Gift: Perfect for students, teachers, or as a lab essential

Specifications:

• Model Number: CS-991ES Plus
• Display: 2-line, 10+2 digit LCD (Natural V.P.A.M.)
• Power Source: Solar + 1 × LR44 (AG13) battery
• Functions: 417
• Memory: 9 independent variables + Ans + PreAns
• Dimensions: 16.2 cm (W) × 8.0 cm (D) × 1.5 cm (H)
• Weight: 125 g
• Material: ABS plastic + rubber key coating
• Color: Silver body with navy blue trim & orange function keys
• Certifications: CE, RoHS

Package Included:

• 1 × CBSSIO CS-991ES Plus Calculator
• 1 × Hard Protective Slide-on Case
• 1 × LR44 Battery (pre-installed)
• 1 × Quick Start Guide (EN/ES/FR)
• 1 × Full User Manual (PDF via QR code or printed)

Note:

• Replace battery when display dims or becomes erratic
• Clean with dry cloth only — avoid moisture or solvents
• Not waterproof — keep away from spills
• Auto power-off after ~6 minutes of inactivity
• For educational and professional use only — not approved for standardized exams unless permitted (check exam board rules)
• The “CBSSIO” brand is an independent manufacturer; this model is compatible in functionality with Casio fx-991ES Plus but is not affiliated with Casio®