Nothing notable about the device save it was only $2 for a working signal tracer with a good eye tube. Couldn't pass it up.
It's a fast, general purpose indicator. It's basically a phosphor cup that glows, a signal is introduced to "open" the eye (the non-lit part at the bottom.)
Since it's purely electronic, you can see fast moving changes in signals, and it can also be used as a quality indicator depending on how far or little the eye opens - and how you have the circuit that controls it designed, of course.
Im pretty sure its cold wherever you are and you out shopping garage sales and shit?
It's chilly here yeah. I'm always out looking at stuff, going to shows.
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