MinnMan EE? My degree is electrical engineering and I agree with your assessment.
My gym has a fancy machine that we stand on and hold handles with our thumbs on a spot on the grips with our arms straight and away from our sides. This machine produces a lot of metrics including muscle density right and left side.
Per instructions, I wet my feet before running the test. The body fat and weight measurements seem about right and correlate to what I see in the mirror and how my clothes fit.