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can you post a picture of the front and back or a list of connections and controls?
I think I dealt with something like this long ago. I'm guessing it takes two sine wave inputs of the same frequency and displays or allows you to measure their relative phase. I don't know what frequency range this covers - could be only audio or video.
Edit: it might be only for power frequencies. Trying to fire up some long-dormant neurons here.
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