EXFO FTB-7000 OTDR for FTB-200 v2 - Manual (Page 105)

Testing Fibers in Fault Finder Mode
OTDR 91
Selecting the Distance Units
To select the distance units for your display:
1. From the button bar, select Setup.
2. From the Setup window, select the General tab.
3. From the Distance units list, select the item corresponding to the
desired units.
4. Press Exit Setup.
You return to the main window and the newly selected measurement
unit appears everywhere these units are used.