Excellent used condition! Texas Instruments TI-Nspire CX CAS Graphing Calculator. Handheld graphing calculator known for its Computer Algebra System (CAS) engine, which enables symbolic and numeric calculations. Offers a screen size of 320 x 240 pixels (3.2" diagonal) with 16-bit color. Powered by a rechargeable battery and includes a USB port for computer connectivity and unit-to-unit communication.