Black Box Pocket Opto Source laser source

The Pocket Opto Source, which can be used with the Pocket Fiber Tester, injects a continuous, nonpulsed signal at a known power level into a terminated multimode fiber optic cable link. In simple terms, you use it to send a beam of light to someone with a tester at the end of the fiber cable. When used with the Pocket Fiber Tester, the Pocket Opto Source is ideal for measuring an installed cable's continuity or attenuation in situations where the cable's ends are too far apart to be connected. It's also small enough to fit into shirt pocket and draws its power from a standard 9-volt battery.