Casio fx-991EX Scientific Calculator Used only twice – in excellent condition, like new. Screen is clear, buttons are responsive, and all functions work perfectly. Features: High-performance Classwiz model 552 functions including matrix, stats, equations, calculus, etc. QR code graph display support Suitable for exams (DSE, IB, university, engineering) Dual power: solar + battery Ideal for students, exam-takers, or engineers.
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