How to calibrate German made Quick Test I/D Snap gauge

There has to be a calibration adjustment. I've never encountered a quality management system that does not require it for all measuring instruments. That just cannot be a disposable tool!
You are absolutely correct. It just goes to show the NORMAL WAY is not THE ONLY WAY. I am including pictures to see what I found and now it is no longer German Wal Art. LOL
 
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