VLF means Quite Small Frequency and is the same technology used in detectors built for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Listed below are 5 reasons why you would possibly choose a VLF over a PI Now http://hotel-golebiewski.phorum.pl/viewtopic.php?p=878597#878597