Textron Greenlee 77M-G Manuel D'instructions page 11

Maintenance
Electric shock hazard:
Before opening the case, remove the test leads from the
circuit and shut off the unit.
Failure to observe this warning could result in injury and can
damage the instrument.
Battery Replacement
1. Remove screw from rear of set holding back cover.
2. Remove back cover.
3. Remove and replace battery.
4. Replace back cover and screw. DO NOT OVERTIGHTEN
SCREW.
Cleaning
Periodically wipe with a damp cloth and mild detergent; do not
use abrasives or solvents.
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