The instrument that ghost hunting television made famous, and a genuinely purpose built one. It combines an EMF reading with ambient temperature, a red backlit display that preserves night vision, and a telescopic REM antenna that radiates its own field and sounds off when something enters it. The ATDD function adds an alarm for temperature deviation, so a cold spot announces itself instead of waiting to be noticed. A flashlight and a burst indicator are usually built in.
It is a niche tool at a niche price, generally three hundred dollars or more, and stock comes in batches from a one man workshop. Nobody needs it to check a fuse box. For teams running long vigils the combination of temperature, EMF and proximity alarm in one hand saves juggling three devices, though the REM antenna also reacts to a passing investigator.
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