Comments about Casio Casio Fx-115es-s-ih Casio Adv. Scientific Calculator (casio Fx115essih):

This is an exceptional calculator that is difficult (read impossible) to find in retail stores; generally speaking only the "MS" models are available, not the "ES".

Functionally and visually, the calculator is similar to the popular FX-991MS, but features one outstanding difference: Natural Display. What this means is you can basically input things into the calculator as they are written in textbooks, and likewise it gives answers in the same format.

This is easily the best scientific calculator I have ever used, and it has so many applications that I only take out my TI-89 when absolutely necessary (like when I *need* to see the graph).

Highly recommended.