EXFO FTB-2 - Manual (Page 29)

Safety Information
FTB-2 and FTB-2 Pro 19
Electrical Safety Information
C
AUTION
The use of voltages higher than those indicated on the label affixed
to your unit may damage the unit.
I
MPORTANT
The operation and storage temperatures of some modules may
differ from the temperatures specified for your platform. In this
case, always ensure that you comply with the most restrictive
conditions (either module or platform).