Newcon Optik NEWCON LRM1500SPD - Manual (Page 15)

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Target reflectivity depends on its color, surface finish, size,
shape, position in relation to the laser beam, etc. Bright target
colors are more reflective than darks. A polished surface is more
reflective than a rough one. Larger targets reflect better than
small ones. Ranging a target perpendicular to the laser beam
provides better results than the one positioned under a sharp
angle to the beam.
Weather conditions that influence air transparency (rain, fog,
snow, mist) reduce maximum range. Bright sunny days will
reduce performance as well, as IR sun radiation may interfere
with reflected laser impulses.
While the unit will measure through many glass types, measuring
through glass may reduce accuracy.
Natural hand tremor decreases the accuracy of long distance
ranging. Using of a tripod is recommended to measure distant
targets.
Mode selection
By pressing the Mode button (5, Fig.1), you can sequentially
scan the Modes. The Mode under selection is indicated on the
Display by flashing of the selectable feature. The "flashing"
feature can be selected by pressing the Action button (6, Fig.1).
The System operates in the setting Modes that are displayed as
follows (refer to Fig.3):
Y/M : units of measurement: yards or meters (3, Fig.3).