LINE SITE LSL-210, Operating Manual

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(2) After switching on the power, use the laser detector measuring the h1 of
X1-beam on the wall or scale plate.
(3) Loose the screw of the tripod, turn around the instrument for 180° to
measure the h2 of X2-beam on the wall or scale- plate. The method
should be the same with h1.
D-value between h1 and h2 ought to be less than 10mm.
(4) Check the Y-beam in the same way.