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 fx-82 SUPER. I bought it in 1.992, use it in college, at the university and 20 years more at the office. Never changed battery and im not going to retire it
CASIO SCIENTIFIC CALCULATOR FX-82ES PLUS FX82 FX-82 FX82-ES PLUS 2nd EDITION | eBay
fx-82ES PLUS WE | SCHOOL & LAB. | Calculators | CASIO
Casio Fx-82ES Plus 2nd Edition calculator REVIEW 😕 Best calculator for college students? - YouTube