EXFO MaxTester Series - Manual (Page 22)

Safety Information
12 MaxTester Series
Electrical Safety Information
Units without Built-In VFL
If your unit is not equipped with a VFL, refer to the user guide of the test
instrument (when applicable) for further laser safety details and
instructions.
Electrical Safety Information
If you need to ensure that the unit is completely turned off, disconnect the
power cable and remove the battery.
Note: There is no need to remove the battery before inserting or removing a
power meter or a VFL, but you need to follow the instructions provided in
the user documentation carefully.