This Texas Instruments TI-83 Plus graphing calculator is a reliable and efficient tool for any mathematician. With its handheld size and compact design, it is perfect for on-the-go calculations. The calculator has been tested and is guaranteed to be in working order. It is a preowned item, but has been well-maintained and is ready for its next owner. The brand, Texas Instruments, is known for producing high-quality calculators, and this model is no exception. It is ideal for use in business, industrial, and office settings.