Nikon IRT 4-12X42 - Manual (Page 11)

Target range cannot be obtained • Be sure that nothing, such as your hand or
finger, is blocking the laser emission aperture
and laser detector.
• Be sure that the laser emission aperture and
laser detector are clean. Clean them if
necessary.
• Be sure that the target shape and condition
is appropriate to reflect the laser beam.
• Replace battery.
[----] (“Cannot measure”) appears
• Be sure to hold the unit steady while
depressing the POWER button.
• Be sure the target is within measuring range
(33-766 yards)
Closer target cannot be measured • Be sure that nothing, such as leaves or
grass, is between the Laser IRT and the target.
Target beyond a certain distance
• Be sure that nothing, such as leaves or
cannot be measured grass, is between the Laser IRT and the target.
Measurement result is unstable
• Replace battery.
• Be sure the target shape and condition is
appropriate to reflect the laser beam.
• Be sure to hold the unit steady while
measuring the distance.
• Be sure that nothing, such as leaves or
grass, is between the Laser IRT and the target.
Incorrect result is displayed
• Replace battery.