VLF means Extremely Lower Frequency and is the same technologies Employed in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from three kHz to 70 kHz. Here's five explanation why you would possibly select a VLF above a PI The subsequent metal http://leydis16.phorum.pl/viewtopic.php?p=1026025#1026025