Ok have a new idea. But maybe first why I want to know my error. I want to use a software like Autolevel which can adapt my gcode according to a error matrix.
What about putting a water filled basin under my accessible area which would be leveled by nature. Now I would put a voltage source in my water. Then I could clamp a simple voltage sensor in my router. And now I could take measurements when my sensor hits the water.
Simple and easy. What do you think

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