VLF stands for Incredibly Low Frequency and is identical engineering used in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Listed below are five reasons why you could possibly go with a VLF above a PI http://eurotrucksimulator.phorum.pl/viewtopic.php?p=1524385#1524385