The Casio JF-100MS 10-digit display desktop Calculator compact enough for use on your desktop, in your briefcase or your attaches, yet large enough so that its easy to read. The JF-100MS features an extra-large 10-digit display for convenient viewing. Calculator is ideal for home, office, school use and provides immediate answers. Solar power with battery backup, works even in complete darkness, automatic shutoff so battery life is not wasted even if you forget to turn it off. Functions include cost/sell/margin keys as well as tax calculations to simplify your work and save you time. Quick correction key helps fix calculation errors without having to start over saving valuable time. Memory functions make complex calculations go more smoothly and quickly saving valuable time.