Placed on the ear-rod ring
The rod is the brightest ring in the region, and reading its outline for the canal's puts the point on the rod's roof. It is the single commonest beginner error on a ceph.
Point · Po
Porion (Po)
The top of the external auditory meatus — the point everyone gets wrong first.
At Beginner a placement counts as found within 3.3 mm of the reviewed reading.
How to find it
Press a step to be shown it on the ceph.
Common errors
Each figure is the reviewed reading of Porion (Po) and a typical miss, on the same ceph, at the distance the mistake usually goes.
Placed on the condyle
The condylar head sits above and in front of the meatus and is far more legible; the point climbs to it when the canal is faint.
Used in
10 measurements are built on it. Miss it, and every one of them moves.
Your record
You have not placed this one yet.