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CTIFREE FC‑991ES Plus is a full featured scientific calculator boasting 417 built in functions, including trigonometry, statistics, calculus, complex number operations, and unit conversions. It features a two way power source (button battery + solar) and a 10 + 2 digit natural textbook style display for textbook style expression input that enhances readability and understanding.
Brand
CTIFREE
Color
Black
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