From the Manufacturer The Ghost Meter has been calibrated to ignore theextremely subtle EMF emissions surrounding the human body, yet is stillsensitive enough to detect the small, distinct, erratic EMF energyfluctuations frequently found at reputed haunted locations. The Ghost Meterprovides three corroborating indicators of EMF emission strength. A needlebased display, LED lights, and an adjustable audio signal. The response timeof this meter is excellent, easily outperforming more expensive EMF meters. Itcan also be operated in silent mode so it doesn’t interfere with EVP(Electronic Voice Phenomenon) recordings or distract other investigatorsduring an investigation. Compare the value this meter offers compared to otherbrands. There is no other offer that comes close to providing these levels offeatures and performance for the price. You’ve seen television ghost huntersuse similar detectors. Now you can get your own and start investigating theunknown.Please note: this product is intended to measure electric fields, anddoes not detect nuclear radiation.