- "Those aren't harvester units."
"No, they're seismic surveyors. They use their instruments to create a 3-D map of the rock formations beneath the surface."
- ―Zare Leonis and Merei Spanjaf
Seismic surveyors were a type of droid used in mining operations. The droids were able to create a three-dimensional map of underground rock formations, which was useful in optimizing mineral extraction. After the Galactic Empire bought out the Ollet homestead, they sent in these droids in order to survey the area for conversion to mining. When Beck Ollet and his friends Zare Leonis and Merei Spanjaf paid a visit to the jogan fruit orchards there, they discovered that a number of the droids had been set to explode. The groups' visit had inadvertently interrupted this sabotage attempt, as the bombers hadn't had a chance to set the primers. Leonis informed the authorities of the sabotage and they defused the explosives.
- Servants of the Empire: Edge of the Galaxy (First appearance)