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National Geographic 4x21
Инструкция по эксплуатации Страница: 9

Bresser National Geographic 4x21 [9/32] Inserting the battery

Range ﬁ nders can be widely used in sports and activities like golf

and hunting to measure the distance, of buildings or electrical

wire poles, as well as to measure the general terrain.

Fig. 1 shows the shape of the range ﬁ nder.

Inserting the battery

Slide the battery compartment cover (Fig. 1, 6) out using your

thumb, and raise it up. Insert the 9V compound battery into the

compartment, padded corners ﬁ rst.

NOTE:

Make sure when inserting the battery that

the polarity is correct (+/–) as shown on

the compartment cover.

After inserting the battery, press the cover down again,

and slide it back to its original position against the direction of

the arrow on the cover.

Operation

1. Look through the eyepiece (Fig. 1, 1). As this device has a

ﬁ xed focus system, there is no need to focus manually.

2. Depress the function button (Fig. 1, 5) for about 3 seconds

to turn the device on. Now when you look into the eyepiece

(Fig. 1, 1), the function symbols appear in the lens coverage

(Fig. 2).

3. To measure distance, aim the central circle (Fig. 2, 1) at the

object, and then press the function button (Fig. 1, 5) brieﬂ y.

The distance of the object will be shown at the top of the func-

tion display.

4. When turning on the device, the measurement unit last used

(M, for metres, or Y, for yards) (Fig. 2, 2/3) will appear. This

can be changed by pressing the mode button and holding it

down after turning the range ﬁ nder on. The measurement unit

in the display will then change.

5. The power will be switched off automatically after approxi-

mately 15 seconds if the distance-measuring instrument is

not used.

NOTE:

Distance measuring with the range ﬁ nder is affec-

ted by the characteristics of the object (i.e. color,

surface ﬁ nish, size and shape), the angle of the

emitted laser beam to the target and the lighting

conditions (e.g. the visibility due to the weather).

If the object is large, the color of the object is bright (highly re-

ﬂ ective), the surface is smooth and shiny and the laser beam is

perpendicular to the surface of the object, the maximum range

is increased. Conversely, if these conditions are not met, the

maximum range is decreased.

Measurement precision may be inﬂ uenced by grass, leaves,

twigs and other debris covering the object.

Bresser National Geographic 4x21 [9/32] Inserting the battery

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