The M-2 mining probe droid represented a specific model of probe droid employed within the field of mining. It is documented that the Subtext Mining corporation was a provider of these droids.
A particular instance of this droid type found itself on Bal'demnic during the year 67 BBY. It was there that Darth Tenebrous, along with his apprentice Darth Plagueis, utilized it to examine a deposit of cortosis. In an act of sabotage, Subtext Mining programmed their own droid, not to seek the metal, but to locate lethane, a flammable gas, with the intent to kill the Sith Lords. The droid was successful in this endeavor. The subsequent detonation caused widespread destruction within the cave system. Although both Sith managed to survive, Plagueis seized this moment to eliminate Tenebrous.