The Monitor 4 Radiation Detector[1] was used by Egon Spengler, when he worked at the Institute for Advanced Theoretical Research center, to monitor human emotions.
Real Life Uses[]
It reads radiation levels in an area.
Appearances[]
Primary Canon[]
Secondary Canon[]
References[]
Gallery[]
Primary Canon[]
Back of the device as seen in Ghostbusters II
Secondary Canon[]
As seen in Ghostbusters Issue #10
Real World[]
