This is, or at least should be, the standard calculator in schools and offices up and down the country. Its greatest plus point is its ease of use, so many calculators try to cram hundreds of functions and writting onto a small space. This however is simple to use, the buttons and words are spaced out and is small enough to fit into a pocket. Yet it is still able to carry out complicated operations, it includes inverse trigonometric, logarithmic and exponential functions, all on a sleek looking, pencil thin piece of kit. The solar panel on this model is a possible as (although using a calculator is not particularly energy consuming) the battery will run down, and although inexpensive to replace, it is very irritating if you go to use a calculator and you find out the battery is dead. In my opinion, although this might sound odd, Casio calculators are an outstanding piece of engineering