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

Manufacturer: Precision Rated Optics