VLF stands for Really Low Frequency and is the same engineering Employed in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Listed below are 5 explanations why you would possibly decide on a VLF in excess http://nec.phorum.pl/viewtopic.php?p=753912#753912