The K2 meter and the SB7 are two of the most frequently used pieces of gear by paranormal investigators and are most frequently seen on the many investigative TV shows. The K2 meter, a.k.a. K-II EMF Meter is the authentic USA made one (watch out for counterfeits that say USA on the front but are in fact made in China and do not work properly - the fake copy version meter label looks different than what you see pictured here). EMF, which stands for electromagnetic fields, are emitted by electrical devices of all types. The K-II meter will produce a steady reading when man made EMFs are present. Paranormal researchers have found that erratic EMF readings correlate with people experiencing paranormal phenomena. The K2 meters lights will flash all of them or just one or a few lights depending on how strong or close the suspected paranormal activity is. It is a very sturdy high quality instrument that lasts a life time. The P-SB7 (a.k.a. SB7) Spirit Box fits in your hand. It scans the AM and FM band without stopping so that one is able to listen for EVP (Electronic Voice Phenomena) in the white noise between the station. An external speaker or earbuds (both included) has to be used since the internal speaker is tuned down in order to allow capacity for the needed modifications for optimum EVP search capacity.