HEDÜ M-I Mode D'emploi page 19

Plumb lines (only M-IIS)
The centring plate makes it easier placing your M-IIS exactly
on a point on the ground.
You need an M-IIS with a screwed on rotation adapter and
the centring plate.
Put the centring plate on the ground so that the
intersection point of the cross lies over the point which
should be plumbed.
You find three hollows on the centring plate.
Put the M-IIS with the feet of the rotation adapter in these
hollows.
Switch on all three laser lines with the MODE-button.
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