Amazon.com : Emraw 240 Functions Scientific Calculator with Slide-On Case Electronic Large Display Battery Included Big Buttons Handheld Standard Functional Office Scientific Calculator (Pack of 2) : Office Products
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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
Reviews for Casio FX-991ES Plus-2nd Edition Scientific Calculator | BestViewsReviews
Casio FX-82MS Scientific Calculator for sale online | eBay