The Texas Instruments TI-30X IIS Scientific Calculator in blue is a reliable and efficient tool for various mathematical calculations. With its solar power source, this calculator is environmentally friendly and convenient for use in office settings or educational environments. The tested and working TI-30X model ensures accuracy and functionality for your everyday computing needs. Complete with a cover for added protection, this scientific calculator by Texas Instruments is a practical and dependable choice for those seeking precision in their calculations. E19