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
Casio fx-82MS Teardown - iFixit Repair Guide
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HOW TO CHANGE CALCULATOR BATTERY / CASIO CALCULATOR / FX-991MS / DIY / JACK OFALL - YouTube
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Casio FX-82MS-2 School Calculator Black Display (Digits): 12 Battery Operated (W x H x D) 77 x 14 x 1: Amazon.co.uk: Stationery & Office Supplies
Casio fx-85MS S-VPAM Scientific Solar / LR44 Battery Power Calculator w/ Case | eBay
Inside a Calculator Casio fx-82MS | Battery check | Internal Circuitry | Full calculator check - YouTube
Amazon.com : 2 Pack Scientific Calculator 2 Line Fraction Calculator with Protective Hard Cover and Battery Basic Math Calculator Chemistry Calculator Black Financial Calculator for School Business : Office Products