Der Quibblemeister says this is a lousy mangled pretentious
metaphor. It falsely implies a machine made criterion of high accuracy.

Well, a lot of metaphors are pretentious. I wouldn't have thought it implied that high a level of accuracy, however. But what do I know?

well, some of us have been known to suffer from hypretension...

And Fraunhofer learned to identify elements in solar
spectra by dark lines. Gotta go look that up.
http://66.102.7.104/search?q=cache:1jmIbFaQOdoJ:home.achilles.net/~jtalbot/spectra/Fraunhofer.html+Frauenhofer+dark+lines&hl=en&ie=UTF-8

I see I gave him too much credit. But still a nice piece of
work. Sorry about wide screen.