Sper Scientific 850013 Advanced Datalogging Sound Meter - Manual (Page 7)

7
POWER SUPPLY
The meter is powered by 4 AA 1.5V batteries or an AC
adapter. When using the AC adapter, insert the adapter
plug into the DC9V connector on the bottom of the meter.
Note…
When the AC adapter is connected, the meter will supply
power from the adapter rather than the batteries.
When using batteries as the power source, periodically
check the folowing indicator to determine the battery
capacity.
When the battery power is almost empty, the symbol
will disappear from the LCD. Press MEM or REC. “Lo Bat”
appears on the LCD. If the meter is in recording mode, it
will stop recording.
For battery replacement, see page 18.