VLF stands for Pretty Minimal Frequency and is identical engineering Utilized in detectors built for coins, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Listed below are 5 reasons why you might pick a VLF in excess of a PI http://lkf.phorum.pl/viewtopic.php?p=53151&sid=ee41a2acd54159409d5e7f82544d229b#53151