Request InfoSantec California Corp.The OP940-OP725 bidirectional insertion loss/return loss test system from OptoTest Corp. allows fiber optic system operators to get real-time results or reflectance scans in either direction. Upgrades OP940 loss meter allow direct control of the OP725 through a USB link. The new device can be controlled via computer software and can also be used as a 2 × 2 optical switch with OptoTest software, making any source unit bidirectional. 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