recommend multimeter

cr0sh beat me to it, but I have this one, which looks about identical to his link.

I think I may get a super-cheap one tomorrow, and then upgrade to a decent one (like yours, hopefully when there's another sale).

Duh. I have a $120 DMM I bought over 10 years ago, but the $5 Harbor Freight one is all
I use anymore. I seriously doubt you'll get any added value by spending $45 more to get
a "decent" one.