Casio - FX-82MS. I bought it in high school, used it in University and now on my 4th year as a Professional Accountant. Haven't changed the battery once. : r/BuyItForLife
Battery Calculation Casio Scientific Calculator Fx82 MS
Buy Casio Scientific Calculator FX-82MS-2 For Engineering Students Online at Best Price|CasioIndiashop.com
CASIO FX-82MS SCI Calc SVPAM 12 Digt 240 Function Cover_Cleaned & New Battery $17.99 - PicClick AU