VLF means Extremely Reduced Frequency and is identical engineering Employed in detectors developed for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Here i will discuss five explanations why you could opt for a VLF more than a PI http://hotel-golebiewski.phorum.pl/viewtopic.php?p=870910#870910