VLF means Pretty Lower Frequency and is identical engineering Utilized in detectors constructed for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Allow me to share 5 explanation why you could possibly decide on a VLF over a PI http://taniecirlandzki.phorum.pl/viewtopic.php?p=120667#120667