CASIO Fx-991CNCW Scientific Calculator, Upgraded Version of Fx-991, for College Students' Postgraduate Entrance Exams And Chemistry, Physics, Biology Competitions, Exam-Specific Learning, Black Color (Random Delivery of New Or Old Models)

Independent function control keys for variables, functions, tools, and menus for convenient operation

One-key conversion between exact values and decimals, including angle/coordinate conversions and algebraic/complex number forms

Supports statistical analysis, function tables, equations, inequalities, complex numbers, matrices, vectors, distributions, and data tables

Icon-based menu system for quick and user-friendly navigation

Solar and button battery (LR44) dual power supply for reliable operation

Calculator x1 (pre-installed batteries)

Instruction manual x1

Warranty card x1

Solar & button battery (LR44) included

Recommended by gold medalists from national student competitions in physics, chemistry, biology, and earth sciences

Official genuine product with unique anti-counterfeit code ("one product, one code") on packaging for authenticity verification via QR code scan

Random shipment of first or second generation models due to product upgrades

Supports Chinese language interface and documentation

Compatible with A4 paper size for printing comparison

Solar panel and one LR44 button battery (pre-installed)

Some models use AAA x1 (R03) battery

Four-level grayscale LCD

Clear input position highlighting

Combination of text and symbols for better readability

23 internal calculation digits

Supports complex calculations including trigonometric, logarithmic, exponential, and statistical functions

Icon menu and list menu for function selection

Independent keys for variables, functions, tools, and directory

One-key conversion for angle units and number formats

Official CASIO product with anti-counterfeit verification

Warranty card included

Product upgrades may result in shipment of either first or second generation models

Participation in CASIO survey via QR code scan offers chances to win CASIO watches or calculators