Waveform Vector Monitor

Where can I find information on electronic equipment?
I have electronic testing equipment. I dont know much about them and I need more information so I can sell them. I have pictures if you know about this stuff and can help me. Can anyone suggest a good forum or website?
I have a:
LEADER NTSC Vector Scope 5854
LEADER Waveform Monitor 5864A
surch the web.
Multi HD/SDI Vector Waveform Monitor from Leader Instruments