Its a time-delay relay that has all sorts of added functionality so it can be used in all sorts of different ways.
For example, it could be set up to turn on a light in, say, 15 minutes. It could also be set to turn a light off after 15 minutes.
It isn't really a piece of test equipment. I don't know the
eBay categories, but it would go under something like electronic or electric controls or relays, or even better, if they had the category, "time delay relays".
You should be able to sell it pretty easily on eBay. Not sure what kind of price range, but if you look up "time delay relays" you should get an idea of what others go for.
Jon.
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