generally you'd want to get 3.5mm to bnc cables - but this oscilloscope doesn't seem to support them - possibly better searching for scopes that are recommended for eurorack users (try searching on modwiggler!)
I'd probably look around based on those (they'll probably be a little bit more expensive though - unless you can find a slightly older module used...
I just use a cheap multimeter for checking my DIY builds...
personally I'd go for a expert sleepers interface (which I have) and use one of the scopes in vcvrack if I needed it - never have though...
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities