olsonm3915
Well-known member
+1 to that. I've seen them marked incorrectly, whether that was due to someone grinding them, I don't know. But it's quite easy to measure them quickly using a caliper.If shim adjustments are required, I would not trust the printed numbers anyway.
A caliper (digital or mechanical dial) is quicker than a micrometer, and plenty accurate enough for shim measurements of unmodified shims. If you want to check for thickness variation across the shim's diameter while lapping/grinding them (a practice I would definitely not recommend), then a micrometer would be necessary.