This Texas Instruments TI-30X IIS black scientific calculator has been tested and is in great working condition. The calculator features regular key size, regular display size, and comes in a handheld size. It is powered by both solar and battery, making it a reliable choice for any user. The calculator is from the TI-30X IIS model, which is perfect for both students and professionals in the business and industrial sectors. This item is a great addition to your office equipment and is perfect for all your calculating needs.