Sokkia SDL30 Operator's Manual page 71

70
4 Remove the adjusting screw cover
and insert a hexagonal wrench (M3)
in the adjusting screw.
5 Turn the adjusting screw, then repeat
steps 1 and 2. Adjust so that the
difference between the two measure-
ments is less than 2mm.
If the measurement at step 2 is larger
than the measurement at step 1, lower
the cross-line by slightly loosening the
adjusting screw.
If the measurement at step 2 is
smaller than the measurement at step
1, raise the cross-line by slightly
tightening the adjusting screw.
6 Replace the adjusting screw cover.