HP HP48GX RPN Expandable Graphic Calculator -

Over 2,300 functions including over 300 for scientific and engineering applications
Built-in equation library with over 300 formulas and constants
2-way infrared communication, RS-232C serial port; supports optional printer
128 KB memory; 2 card ports for expandable RAM and ROM
2-D and 3-D graphing capabilities

Includes soft zip cover.