I remember reading L. Ron was very particular about the E-meter dynamics. He was unhappy with a new model and totally redid the panel meter. Its ballistics, bobbing had to be just right because a certain wiggle means the alternate universe is communicating and you are not clear, there is a problem with your thetan.
Whoever designed this and what firm manufactures this, I believe the latest models are digital w/firmware, must be basking in his Lambo...