VLF means Very Minimal Frequency and is similar technological know-how used in detectors developed for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Listed here are 5 reasons why you could pick a VLF above a PI The MINELAB http://taniecirlandzki.phorum.pl/viewtopic.php?p=120667#120667