How do you check a reference line on a foundation wall?

Concrete
Layout
Accuracy

Everything set off a foundation wall trusts the reference line snapped on it, and a chalk line over green concrete can drift where the surface is rough or the snap was long. The T1R Range projects a green line along the wall that can be laid over the existing mark, so any wander shows up as a gap between the two rather than as a problem discovered when the plate does not sit. The distance reads on the tool while the line is still up.

How the line gets verified

Everything downstream trusts this line
Chalk drifts on rough green concrete
T1R lays its own line over the mark
Any wander shows as a gap, not a surprise
Distance reads on the T1R Range as you go

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A poured concrete foundation wall is checked with the tool held against its face, form-tie marks and surface texture visible. A green line is projected along the wall and run horizontally over the existing reference mark, tracking along it across several frames. The tool stays against the concrete rather than being set on the ground.