Casio FX 991 ES Plus Scientific Calculator - 2nd Edition (Prototype)
Amazon.co.jp: Casio fx-991ES Plus 2 Scientific Calculator with 417 Functions and Displays, Natural : 文房具・オフィス用品
Casio Fx-991 MS Scientific Calculator | eCommerce Online Shop
Casio Scientific Calculator FX-991ES Plus Calculators New Edition-2 Heavy Duty FX991ES Plus FX 991 ES Plus - 1 Unit With Free 2pcs Ball Pen- Genuine and Original | Lazada PH