The FX-991 CW is the new upgraded version of the FX-991 EX with additional features including high-definition display and improved menu navigation. Approved for use in every UK exam where a calculator is permitted recommended for Advanced GCSE A/AS level and Highers this scientific calculator is allowed in every UK examination. The large Natural Textbook Display (Natural-V.P.A.M.) shows mathematical expressions like roots and fractions as they appear in textbooks for improved learning and comprehension. Dual powered by solar with battery back-up and auto-power off the calculator features a clip-on protective hard cover and is supplied with a three-year guarantee.