VLF means Really Very low Frequency and is similar know-how used in detectors crafted for cash, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Listed here are 5 main reasons why you could go with a VLF over a PI http://eurotrucksimulator.phorum.pl/viewtopic.php?p=1528794#1528794