VLF means Pretty Reduced Frequency and is similar technological know-how used in detectors constructed for coins, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from 3 kHz to 70 kHz. Here i will discuss 5 reasons why you would possibly choose a VLF above a PI http://hotel-golebiewski.phorum.pl/viewtopic.php?p=878597#878597