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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
Amazon.com: Casio Fx-82es Fx82es Plus Bk Display Scientific Calculations Calculator with 252 Functions : Office Products
Casio Fx-82 ES Plus Calculator Natural-V.A.P.M | eBay