Just because a measuring device is not standards referenced does not mean it can not be used to measure. If I need a peg to match the size of a drill bit, any collection of 12 holes is likely to have one the size of the drill bit that lets me tell my peg maker to "make the pegs this size." Handymen are just cussed enough* to not label any of them, and to expect the FNG (new guy) to remember which of the 12 unlabeled…
Furthermore this article only states: “They are not of a standard size, so will not be measuring devices." , which is incorrect since for use as a coincidence rangefinder (standardized to some standard) only the ratios between sizes of opposite holes would need to be standardized, not the size of the thing as a whole. The paper "Roman Dodecahedron as dioptron: analysis of freely available data" ( https://arxiv.org/ab…
You can use anything as a "ruler" to measure something and transfer that measurement to something else. It's what a jig or form does, after all.