VLF means Pretty Reduced Frequency and is the same engineering Employed in detectors crafted for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Listed below are 5 explanations why you may opt for a VLF about a PI Our http://nec.phorum.pl/viewtopic.php?p=763265#763265