"Your eyes can deceive you; don't trust them."
Though I've used something like SlaterSpeed's "Z" rod method, I don't like to intervene the measurement with those two fine instruments: the dial gauge, and the human eye. This just adds error upon error. Try grazing the table with the rod itself, and listening. Variations in pressure yield distinct sounds.
Of course this method is hopelessly subjective, but an attentive individual with normal hearing can get nearer true using it than by splitting hairs squinting at a dialface, or worse yet reading numbers off one.
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