The See-Through Device is a piece of PPC technology invented by Makes-Things to allow agents to see into spaces where they otherwise could not. The device is useful for observing Mary Sues and OCs in situations where actually entering the room would mean being detected. There appear to be two models. The second model looks like a View-Master® (don't confuse it with a field-model Memory Implant Device!) and works by holding it up to your eyes, looking at an obstacle, and clicking the lever-like button on the side.