Wow Creep, you musta worked in a bicycle shop at some point, no?
I use mostly SOUND and FEEL to adjust my spokes.
Take your spoke wrench or "other" device and go round the wheel
and tap each spoke. They should play like a Zylophone if all adusted
correctly. The "tone" should be close but will not really change because
the spoke length is always the same. But a "tone" means your in the ball
park. A rattle or thud means that spoke is loose. feel it. Its loose, right?
Tighten until you've got a tone...no more.
Tighten it up, but not too much. You don't want to throw the wheel out
of line. Hard ridden dirt bikes will develop loose spokes from time to time.
No big deal. Most Japanese wheels require very minimal and infrequent
adjustment in my experience. I like Creepers oil idea. Keep it off the disc
and pads though. Could oiled spokes slip more with use?