Arduino board can become anything in good hands. Like this time- Arduino is used in oscilloscope project. Actually this is not a stand alone project but combination of Arduno and some processing done on PC.
This is not a technical masterpiece, but it may be fun to experiment. Arduino simply reads analogue voltage via 10 bit ADC channel and sends it to PM through serial communication interface. To make it work you will need Arduino with working code of course and processing code that runs on open source programming language.