How do you check a shower head is centred on the drain?

Plumbing
Punch List
Accuracy

Centred by eye is not centred, and a shower head that sits off the drain line is the kind of thing a homeowner spots on the walkthrough. Picking up the drain centre with the T1 Tomahawk gives a figure off the wall, thirteen inches here, and carrying that same number up to the head closes the item in about fifteen seconds.

Why this shows up on a punch list

Centred by eye is not centred
T1 picks up the drain centre off the wall
Carry the same figure up to the head
Confirmed, not estimated
Spotted on a walkthrough otherwise

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Centred by eye is not centred, and a shower head that is off reads as sloppy work to whoever signs off the job. Picking up the centre line of the drain cover gives you a number off the wall, thirteen inches here, and carrying that same figure up to the head is a punch list item closed in about fifteen seconds.