Bresser National Geographic 4x21 [10/32] Notes on cleaning
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Bresser National Geographic 4x21 [10/32] Notes on cleaning

Bresser National Geographic 4x21 [10/32] Notes on cleaning
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
Coating: Objective lens with multiple coatings,
Eyepiece and prisms fully coated
Diameter of the exit pupil: 5 mm
Distance of the exit pupil: 20.4 mm
Type of focusing adjustment: Fixed focus
Magnifi cation: 4X
Field of view: 140 m/1.000 m
Angle of view: 8 degrees
Batteries or accumulators:
9V compound battery (type 6LR61)
Impulse laser diode:
Type OSRAM SPL PL90
LED class 1 · P=25 W ·
λ
=905 nm
EN 60825-1:1994 + A1:2002 + A2:2001
NOTES on cleaning
• Separate the device from the power supply before cleaning by
removing the plug or batteries.
• Clean the eyepieces and lenses only with a soft, lint-free cloth,
like a microfi bre cloth. Do not apply excess pressure to the
cloth to avoid scratching the lenses.
• To remove more stubborn dirt, moisten the cleaning cloth with
an eyeglass-cleaning solution, and wipe the lenses gently.
• Protect the device from dust and moisture. Store it in the sup-
plied bag or transportation packaging. The batteries should be
removed from the unit if it has not been used for a long time.

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