VLF means Very Lower Frequency and is the same technological know-how used in detectors crafted for coins, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from 3 kHz to 70 kHz. Listed here are five explanation why you may pick a VLF over a PI a http://hotel-golebiewski.phorum.pl/viewtopic.php?p=882195#882195