Casio CFX-9850GC Plus Graphing Calculator (White)

The large, readable display exhibits eight lines and 21 characters (15-digit, 10-plus-2 display) in three colors. Graphing functions include rectangular and polar coordinates, parametric, inequality, and vertical lines. Since graphing is animated, you can change the variables in a formula and watch the graph move accordingly.

It also performs statistical calculations such as scatter plots, histograms, box and whisker plots, and eight regression types. The dual screen shows two graphs: a graph and zoom or a graph and table on the same display. In statistical graphing you can use list-based matrix calculations of up to 26 matrices. The list editor manages up to 36 data lists and exchanges data with matrix and table modes. An instant-replay key recalls your previous entries.

The built-in communications port enables linkup to a personal computer. The CFX-9850GC PLUS stores up to 38 programs with 32 KB total memory. It is protected by a hard slide case and powered by four AAA alkaline batteries and a lithium battery for backup to preserve a constant memory even when the unit is turned off.

The Casio CFX-9850GC PLUS comes with a comprehensive guidebook and is supported by a one-year limited warranty. --Barbara Price