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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-2 Scientific Calculator, Battery Operated, Grey & Carson LinenTest 5X Folding Magnifying Glass and Thread Counter with Measuring Scale (LT-30) : Amazon.de: Stationery & Office Supplies
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Inside a Calculator Casio fx-82MS | Battery check | Internal Circuitry | Full calculator check - YouTube
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