Ian, that's the sort of thing I was indirectly referring to. There are ways to fool those little testers .... and the unscrupulous seller will do so - then present the place as having all new, grounded electrical. There's a word for that: Fraud. Likewise, I have yet to find someone who has used a GFCI breaker in this situation.

The Home Inspector forums were all upset when someone let the cat out of the bag .... these guys had been placing so much faith in those testers. Viewing their forums today, they still focus on what's 'easy to inspect,' and dither over minute details .... rather than take a substantial look at things. Add to that their airs of self importance, and it's almost comical.

That 'service upgrade' has all the hallmarks of a non-permitted DIY / handyman job - and it's ugly, too! laugh