... performance, cost-effective optical network analysis tester. WF20A series handhold OTDR is mainly used for the following tests:l Determine fiber ... fiber optic cable, optical fiber’s reflection loss; WF20A handhold OTDR can be widely used in metropolitan, WAN, CATV and other ... storage capacity180 test curveSize220mm×110mm×70mm optical time-domain reflectometer (OTDR) WF20A