The TI-83 Plus is an easy-to-use graphing calculator for math and science that lets students graph and compare functions, as well as perform data plotting and analysis. Its FLASH ROM memory allows students to update and add software applications (Apps). Count on TI calculators at exam time. You can use this TI graphing calculator on the PSAT, SAT and ACT college entrance exams, IB and AP tests.
Reddit mentions
“Mine’s only 20 years old, not 40, but I still use my TI-83 almost daily. Replaced the cover a few years ago when the original wore out. Lives loose in my backpack. Love that thing.”