Product Description

Power Through Any Exam
The CTIFREE 991ES Plus 2nd Edition Scientific Calculator is your essential tool for high school, college, and professional exams. With 417 built‑in functions, a large two‑line natural display, and dual power source (solar + battery), it handles everything from basic arithmetic to complex calculus and matrix calculations. Approved for most standardized tests (SAT, ACT, AP, GCSE, A‑Levels, etc.) — no graphing, no programmable storage, just pure calculating power.

Why Students Love It

417 Comprehensive Functions: Includes equations, integrals, derivatives, statistics, matrix/vector calculations, complex numbers, and base conversions.

Natural Textbook Display: Shows fractions, square roots, exponents, and integrals just as they appear in your textbook — no more guessing.

Large 10+2 Digit Screen: Multi‑line display lets you review previous entries and edit formulas easily.

Dual Power Source: Solar cell with battery backup ensures you never run out of juice during a long exam.

Lightweight & Portable: Weighs just 220g and slips into any bag or pencil case.

Product Details

Model: 991ES Plus 2nd Edition (417 Functions)

Display: 10+2 Digits, Natural V.P.A.M. (Visually Perfect Algebraic Method)

Power: Solar + LR44 Battery (Included)

Material: ABS Plastic (Durable, Drop‑Resistant)

Dimensions: 17.42 × 8.12 × 0.90 cm

Weight: 220g

Colors: Black (Large Screen), Silver (Large Screen)

Also Available: 991EX with 552 Functions (Large Screen)

Perfect For

GCSE, A‑Level, SAT, ACT, AP exams

High school & university math, physics, engineering

Professional certification tests (PE, FE, etc.)

Daily homework and lab work

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