I have a good quality meter, but that won't catch a momentary voltage drop. No recording oscilloscope here... I have like 9 computers in the house, plus all the usual tech gadgets common these days. I would have expected to notice a power problem before now, but this is beyond my understanding.
Since I've tried both our generators, plus running off battery on the UPS, I just don't see that as a problem but I certainly can be wrong...