VLF means Really Low Frequency and is identical technological innovation Employed in detectors constructed for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Listed below are five main reasons why you could decide on a VLF about a PI http://sarmacikrolewscy.phorum.pl/viewtopic.php?p=24911&sid=dea0ea68aacce70d12eda30cb02178c9#24911