I'd hesitate to say "fetish" since I don't worship them, but they are sometimes in the back of a drawer like a good luck charm, only brought out for special occasions.
I often wonder at my interest in acquiring tools that can measure orders of magnitude smaller than my capabilities to achieve this, and certainly my SPI Bore Gauges, which indicate out to 0.00005":
View attachment 510393
(only spent $175 on them, otherwise something like this would never be in my collection)
All of my setting rings also go out 5 significant figures to the right of the decimal point; somewhat ridiculous when checking an inside micrometer that reads to 0.001".