The Texas Instruments TI-89 Titanium Graphing Calculator is a reliable tool for business, industrial, and office use. With its sleek black design and convenient cover, this graphing calculator is perfect for solving complex equations and creating graphs with ease. Powered by batteries, this model from Texas Instruments is a top choice for professionals and students alike who require accurate calculations and precise graphing capabilities. This calculator is tested and works great and comes with brand new batteries. The only thing wrong with it is one of the springs by the battery broke off but I just hooked it back on the metal piece and it still works great. See pictures.
eBay