VLF means Really Small Frequency and is similar technological know-how Employed in detectors developed for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Listed here are 5 explanations why you might decide on a VLF above a PI Disclosure: https://gspanel.net/showthread.php?tid=44071