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Casio Fx-991 ES PLUS Scientific Calculator. This range of scientific, financial, and graphing calculators provides accurate, reliable calculation capability for students, engineers, accountants, surveyors, and finance professionals. The Casio FX-991ES PLUS 2 (417 functions, Natural Textbook Display) is Ghana's most trusted scientific calculator for WASSCE, university engineering, and science examinations — displaying mathematical expressions exactly as they appear in textbooks. The Casio FX-991EX ClassWiz provides upgraded spreadsheet and QR code output functions — essential for advanced mathematics and physics at university level. The Casio FX-991CW ClassWiz (latest model) provides the most advanced non-programmable scientific calculator available — with Python compatibility and enhanced statistics. The Texas Instruments BA II Plus financial calculator solves time-value-of-money, NPV, IRR, amortisation, and bond calculations — the required calculator for CFA, ACCA, and ICAG professional examinations. The Texas Instruments TI-84 Plus CE colour graphing calculator provides full graphing, statistics, and calculus visualisation for A-level and university mathematics. The Texas Instruments TI-Nspire CX II provides computer algebra system (CAS) capability for the most advanced engineering and mathematics applications. All calculators are genuine, original brand products.