For example: Agilent E4440A or Anritsu 68369
TDR / OTDR
Precision Rated Optics PRO-3MM-83-FP
850/1300nm MM OTDR with LTS and VFL
Manufacturer: Precision Rated Optics
Precision Rated Optics PRO-3Q-FP
850/1300/1310/1550nm Quad OTDR with LTS and VFL
Manufacturer: Precision Rated Optics