Fully functional Tektronix p2100 oscilloscope probe with ground clip and probe tip clip. This is used, but is in great working order; it's been tested and calibrated on an oscilloscope's waveform generator. If you are interested in more than one, let me know, since I have a few for sale. $20, unless you're getting more than one.

See here for the probe specs:
http://www.tek.com/Measurement/Products/catalog/p2100/