EXFO MaxTester Series - Manual (Page 142)

Maintenance
132 MaxTester Series
Installing or Removing the Power Meter and VFL
5. On the top panel of the unit, locate the power meter.
6. Using a screwdriver, remove the four screws of the power meter.
Note: If you have a protective cover for the power meter bay, keep the screws
close at hand. You will need them to secure the protective cover in place
later.
I
MPORTANT
Do not discard the screws. You will need them to secure the power
meter in its bay when it is back from calibration.