Ran across this Geiger counter, and thought "I think I could do something with that..."
Since actual radiation is not something to be taken lightly, this was re-engineered to detect a magnet instead of radiation, but otherwise act as if radiation had been detected. So if a magnet it detected at the tip of the wand, the meter will fluctuate, and the speaker will emit traditional radiation detector sounds.
Geiger Counter Escape Room Prop
$395.00Price