GPI GPI-ZL21R, Instruction Manual, Page: 14 / 18

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4.4 Measuring vertical outline
Place a tripod around the object, and set up the
instrument on it, adjust the leveling screws until
the bubble always in the center of place level when
rotating instrument to any direction.
4.4.1 Optical measurement
(1) Turn the eyepiece until the reticle cross-hairs is
clear.
(2) Place a laser target close to object, and turn the
focusing knob until the laser target image is clear
on reticle. There should be no apparent movement
between cross-hairs and target when observer
moves slightly. If there IS parallax, adjust the
focusing knob slightly to remove it.
At last read out the value in the laser target.
Fig. 9