Probe B
Probe B was one of three probes launched from the  when it was scanning an unnamed star system in the Gamma Quadrant for the missing . The probe was equipped with a differential magnetometer, so it could pick up a fluctuation in the hysteresis curve. This curve, caused by the interaction of the magnetic field with metallic composites in the  hull, would be used to find the Yangtze Kiang in the system.

Probe B, on its approach to the sixth planet in the system, detected no change in the hysteresis curve when it scanned the planet and its three moons. ()
Probes