National Geographic 4X21 Instrucciones De Uso página 10

Display System (Fig. 2)
1. Symbol for aim (Fig. 2, 1): The inner circle should be aimed
at the object to be measured.
2. Distance display (Fig. 2, 4): The distance is indicated with
three digits. If '- - - -' is shown, no distance can be measured.
3. Distance unit: M, for metres (Fig. 2, 2); or Y, for yards (Fig.
2, 3)
Troubleshooting
If the range fi nder ceases to function due to incorrect opera-
tion, remove the battery compartment cover (Fig. 1, 6) to cut the
electric current. Then replace the cover, and see if the device
functions normally. If not, consult the dealer. Devices which be-
come defective during the warranty period can be returned to
the dealer where the device was bought.
Specifi cations
Distance measurement range: 4 m up to 800 m
Distance measurement method:
semiconductor laser measurement (harmless for eyes)
Laser wavelength: 905 nm
Accuracy in distance measurement
(under normal conditions):
up to 200 m: +/– 1 m
from 200 m: +/- 5 m
Type of measurement display: Inner vision-fi eld LCD display
Effective aperture of the objective lens: 21mm
10
Coating: Objective lens with
Eyepiece and prisms fully co
Diameter of the exit pupil:
Distance of the exit pupil: 2
Type of focusing adjustme
Magnifi cation: 4X
Field of view: 140 m/1.000
Angle of view: 8 degrees
Batteries or accumulators:
9V compound battery (type 6
Impulse laser diode:
Type OSRAM SPL PL90
LED class 1 · P=25 W · λ=90
EN 60825-1:1994 + A1:200
NOTES on cleaning
• Separate the device from t
removing the plug or batte
• Clean the eyepieces and le
like a microfi bre cloth. Do
cloth to avoid scratching th
• To remove more stubborn
an eyeglass-cleaning solut
• Protect the device from du
plied bag or transportation
removed from the unit if it