VLF stands for Pretty Very low Frequency and is the same technological innovation used in detectors developed for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Listed below are five explanation why you would possibly decide on a VLF http://sarmacikrolewscy.phorum.pl/viewtopic.php?p=24491#24491