Is my Casio fx-991EX genuine or a replica? : r/calculators

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CASIO Scientific Calculator - Original vs Imitation

Is my Casio fx-991EX genuine or a replica? : r/calculators

CASIO ClassWiz Authenticity Check

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How to check an original CASIO fx-991 EX (ClassWiz) scientific calculator

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HOW To Check Original Casio fx-991ES Plus Scientific Calculator, Two Easy Method