A vendor I often buy from sells [iall[/i] his stuff as repair/parts, then puts a note in the description to say that the stuff is tested and working, etc, but he is selling as-is. That's the way to do it.
Except for the fact that most people will browse for "used" items and not "for parts" items, so you get nearly as good a sale price.
The way I see it, the name of the category is what probably drives a lot of people away. Its description is a bit more fair:
" For parts or not working: An item that does not function as intended and is not fully operational. This includes items that are defective in ways that render them difficult to use,
items that require service or repair, or items missing essential components. See the seller’s listing for full details"
My highlight above is what grants your listing as a "For parts or not working".
That is how most sellers here in the US do it, as the power of eBay seems stronger here. Selling something as complex as an oscilloscope is impossible to characterize in a simple few categories, but that is the system. IMHO they should have something similar to Amazon's marketplace (New, Used - Like New, Used - Acceptable, etc.), but the problem then becomes the subjective aspect of the categorization, which would only be fully regulated by the feedback system (which takes time to build).
All in all, it is a bummer but unfortunately any business suffers setbacks from time to time.