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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
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Casio fx-82MS Scientific Calculator 2-Line Display 240 Function STAT Data Editor 4971850137931 | eBay
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Inside a Calculator Casio fx-82MS | Battery check | Internal Circuitry | Full calculator check - YouTube
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FX-82MS 2nd edition | Technical & scientific calculator | School and graphic calculators | Products | CASIO
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