EXFO FTB-2 - Manual (Page 69)

Getting Started with Your Unit
FTB-2 and FTB-2 Pro 59
Securing your Unit Using the Kensington Lock
Securing your Unit Using the Kensington Lock
Your unit is equipped with a security slot to which you can connect an
optional Kensington lock (security cable) to help prevent theft.
To secure your unit:
Connect your lock to the security slot located on the left panel of your unit.