Round Gauge
Description
This gauge measures the roundness of a corner of a part. This is useful when trying to reverse engineer the dimensions of a part.
Instructions
The image should be self explanatory. Hold gauge to part, read number next to the curve that most closely fits the part.
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License
Round Gauge by IHeartRobotics is licensed under the Attribution - Non-Commercial - Share Alike license.

Are the number 1-10mm radius or something imperial?
Yes it is metric, and I am pretty sure it's radius and not diameter but that should be pretty easy to figure out.