Amazon.com: Casio Fx-82es Fx82es Plus Bk Display Scientific Calculations Calculator with 252 Functions : Office Products
82ms-c Student Multifunctional Scientific Trigonometric Function Calculator Plum Red Black Blue Green Color Calculator - Educational Equipment - AliExpress
Casio FX82C Scientific Calculator FX-82C Vintage Calculator with Case | eBay
Casio FX82 calculator I bought in 1982 at the age of 15. Used it throughout school, my apprenticeship and work as a draughtsman. Don't use it much now but it still works