VLF means Quite Small Frequency and is identical technological innovation used in detectors crafted for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Listed below are five main reasons why you might opt for a VLF over a PI http://eurotrucksimulator.phorum.pl/viewtopic.php?p=1524386#1524386