Ruler Help

I want to measure the distance between parts of two design elements; one bar crosses a plane at some angle, and I want to verify that it does so at the required distance. I can get the ruler to show me the distances between the edges of things when they are un-grouped, but the "endpoints/midpoints thing doesn't seem to work and the ruler itself leaps around with no clear way for me to tell it exactly what I want it to measure.


anyone know how to help me with this? Asking for a project a person is working on.


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