With a secondary use for checking how bad your arthritis has become.
While working in a remote and physically difficult location I had a need to check an arbor diameter and judge its concentricity. I could get a caliper on the arbor in one axis only so something better would be needed.
My simple solution was a set of ring sizers as used by jewellers to measure fingers for fitting a ring. These are readily available from multiple sources on Amazon. They come with a sizing chart and are remarkably accurate albeit in weird step sizes.
Sizing the arbor using these rings allowed me to zero in on the best fit. Adding some thin paper around the arbor to pack out the residual gapping allowed me to get a very good feel for how concentric the arbor was.
Not exactly serious engineering practice but needs must.
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