text: Texas Instruments TI-81 Graphing Calculator
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  - Warranty Information
  - 90 Day Exchange Warranty! Buy with confidence. We offer helpful customer service and support for all our products from sale to installation.
  - Currently In Stock! Due to the nature of our inventory this item will only be in stock for a short period of time. Quantity available for bulk purchases
  - What's Included:
  - Calculator and Cover
  Texas Instruments TI-81 Graphing Calculator - Used Item IN STOCK and in good condition. All items have been previously used, but have been fully tested and include a 90 day exchange warranty. Items ship with all needed software and accessories. Since this is a used Item, it may show some minor signs of use but should not affect performance. Manuals can be downloaded below.
  Product Details - Designed for ease of use, the keys of the TI-81 are grouped by color and physical layout to allow easy location of the key you need. The keys are divided into four zones: graphing keys, editing keys, advanced function keys, and scientific calculator keys.
  •8-line by 16-character display
  •Defines, saves, and graphs up to four functions and three parametric equations
  •Enter, save, and manipulate up to three 6x6 matrices
  •Advanced functions accessed through easy-to-use display menus
  •One- and two-variable list-based statistics
  •Saves up to 37 programs in its 2.4K bytes of memory
  •Slide case included