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35
5. Check that the round seal is properly positioned in its groove,
screw the lid back on using the 2 screws.
Always pay attention to the polarity, as positioning the batteries
the wrong way may cause damage.
Batteries of the Light Emitting Diode (LED )Lamp
It is imperative that the batteries of the LED lamp are replaced at
the same time; do not use a battery that is already used or flat
together with a new battery.
To replace the batteries of the lamp:
1. Pull the LED lamp out of the instrument. Turn
the instrument over, and with one finger, push
the lamp out of its housing.
2. Unscrew the cap (the part containing the LED),
see picture opposite.
3. Remove both used batteries and replace them
with 2 new batteries. Be mindful of the polarity.
The + facing down (see picture opposite).
4. Screw the cap tightly back on.
5. Put the LED lamp back into the casing of the
instrument.
Condition of the instrument battery
The instrument gives you the possibility to check the condition of the
battery at any time. This can be checked in 2 ways:
1. When first starting up the instrument (brand new): when
the instrument is off, press briefly on the
button: the
following indications will appear:
(this means that
the instrument is in storage mode),
(GEOS), 127
(the software version), and
(in this example,
the battery voltage is 2.99 Volts).
35


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