VLF means Extremely Small Frequency and is identical know-how Employed in detectors developed for cash, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Here are five main reasons why you would possibly select a VLF in excess of a PI http://lkf.phorum.pl/viewtopic.php?p=53725#53725