The Observer Mk. I was a model of surveillance tagger made by the MechBlaze Tracking Corp. Cheaper than the other brands of tagger like the SureSnoop, the Observer cost 500 credits and had a range of one kilometer.
- Cracken's Rebel Field Guide (First mentioned)
- The Essential Guide to Weapons and Technology
- The Complete Star Wars Encyclopedia
- Star Wars: Edge of the Empire Core Rulebook
- Star Wars: Age of Rebellion Core Rulebook (First identified as Observer Mk. I)