Ya cant use 2 flats ,
put a grade 25 ball on end of the rod .
e base of the mike is large and flat . it IS the ONLY parallel
ya cant , then have a 2nd flat on the rod .
If you want to read depth AND Parallel , you must do MORE work .
Thus rotating rod mikes work fine , especially if you mimic an
electronic edge finder
as depth mik touches bottom , it flashes .
This is something few humans can do ( feel a mik rotation
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