VLF means Very Minimal Frequency and is the same know-how used in detectors developed for coins, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Listed below are 5 reasons why you could possibly decide on a VLF more than a http://hotel-golebiewski.phorum.pl/viewtopic.php?p=870922#870922