VLF means Very Lower Frequency and is the same technological innovation Employed in detectors created 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 may opt for a VLF over a PI http://classichonda.phorum.pl/viewtopic.php?p=173510#173510