Up for sale is a Texas Instruments TI-89 Titanium Graphing Calculator. (Requires 4 AAA batteries which are NOT included due to USPS shipping requirements.) ? Condition: Pre-owned, tested, and fully functional. See photos for cosmetic condition. There are a couple hairline cracks to the housing which are photographed and do not affect functionality. Battery compartment is clean and appears never to have experienced corrosion which is very common with used graphing calculators. Note: There is a faint dark spot on the display (see photos). It does not affect functionality, but worth noting. ? Includes: Original slide cover. One of the little rubber feet on the cover is damaged. ? Calculator works great; all buttons respond correctly. ? Shows normal cosmetic wear from use. Perfect for students and professionals needing advanced math/engineering functions.