Perfect accuracy in stylus gauges is not important, as the set-up is done by ear anyway. I use a couple of cheap gauges, mainly to get some idea and when adjusting to know how much I changed. Absolute value is not that important.
BTW, I find it amusing that cable measurements are the devils handiwork, but an accurate stylus gauge is critical. Never mind ...
BTW2: never heard a difference in any cable, but VTA adjustments are easy to hear. Just to put things into perspective.

