Good tool, works. As with all measurement tools that are not calibrated/certified, you must validate the accuracy, e.g. B. 90ΒΊ/45ΒΊ squares or otherwise before using them for tracing. In this case the center viewfinder has an offset of 0.5mm so I fix that and I'm done. In addition, the ruler already has dents from the fastening screws.
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