David White LT8-300 Owner's Manual page 7

The LT8-300LP is equipped with a laser
plummet and requires a CR2 lithium
battery.
Inserting/Replacing the Battery
Always turn off the laser plummet before
removing and replacing batteries. CR2
lithium battery is recommended for the
instrument.
PREPARATION
To open the battery compartment 19,
unscrew the cap. Insert the battery.
Insert battery using correct polarity
as illustrated.
When the battery becomes weak, the
brightness of laser plummet beam will
weaken.
Remove the battery from the tool when
not using it for extended periods. When
storing for extended periods, the batteries
can corrode and discharge themselves.
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