VLF stands for Quite Very low Frequency and is identical technologies Utilized in detectors constructed for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Listed below are 5 reasons why you could opt for a VLF above a PI http://inquisnower.phorum.pl/viewtopic.php?p=754093#754093