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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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3 pcs Casio FX-82MS Scientific Calculator for School cover/case 2-line display. 4971850137931 | eBay
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3 pcs Casio FX-82MS Scientific Calculator for School cover/case 2-line display. 4971850137931 | eBay
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