Mastech MS2025C User Manual page 14

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WARNING
To avoid electric shock, make sure that the test leads have
been clearly move away from the circuit under
measurement before opening the battery cover.
5.1.1. If the symbol " " appears, it means that the batteries
should be replaced.
5.1.2. Loosen the screw of the battery cover and remove it.
5.1.3. Replace the used battery with a new one.
5.1.4. Return the battery cover and tighten the screw.
Note:
The battery polarity can't be reversed.
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