LINE SITE LSL-210, Руководство по эксплуатации

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6.2 Horizontal line Checking
(1) Place the instrument between two walls with the distance of 30m (or
two scale plates with the distance of 30m).
(2) Place the instrument according to horizontal setting and then adjust
the instrument.
(3) Switch on the power, and then measure the middle point of the laser
beam on the wall (or scale plate).