LaMotte 5 Series pH Meter - Manual (Page 8)

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2.4 Inserting New Batteries
The battery compartment is found at the back of the instrument. To open
the battery compartment, push the cover in the direction of the arrow
and lift up. Note the polarity of the batteries before inserting them into
position. After the batteries have been replaced, reposition the cover and
press down until it locks.
2.5 Battery Replacement
The “LO” annunciator on the LCD alerts when battery power is running
low.
Caution: Power off the meter before changing battery.