Interesting discovery, but I don't see how it's useful. I checked my 87V again today and now it's 2.0855V, so not particularly reliable. Also, I'd want 5V for 5k/50k count DMMs or 1.9V for 2k/20k count DMMs. For sanity checks, just having two DMMs measuring the same thing would be more foolproof, rather than relying on this output. Just my opinion on it.