VLF means Pretty Small Frequency and is similar technology Utilized in detectors designed for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Listed below are five explanation why you could go with a VLF in excess of a PI http://eurotrucksimulator.phorum.pl/viewtopic.php?p=1528794#1528794