Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4"
Amazon.com: Casio FX-991SPX II Iberia- Scientific Calculator, Recommended for Spanish and Portuguese Resume, 576 Functions, Solar and Grey/White : Casio: Office Products
Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Display, Natural