Tektronix SDI wfm601a digital component waveform / vector scope with rack kitmodel WFM601Apal and ntschas parade option, lightning, vector, etc etc, great for SDI studios / OB trucks2 channel SDI input option of coursebackscale bulbs workinggreat picture on scopehas very small crack on bottom plastic so lets through little but of light but this can be repaired with epoxy glue if needed (Ask if you want us to do it)