Casio FX-82 Solar II ab € 14,38 (2022) | Preisvergleich Geizhals Österreich
Casio FX82 calculator I bought in 1982 at the age of 15. Used it throughout school, my apprenticeship and work as a draughtsman. Don't use it much now but it still works
Casio Scientific Calculator fx-991ex / fx-991ES PLUS / fx-991MS / fx-82ES PLUS | eBay