VLF stands for Incredibly Lower Frequency and is the same engineering Utilized in detectors developed for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from three kHz to 70 kHz. Listed below are five reasons why you could select a VLF more than a PI http://leydis16.phorum.pl/viewtopic.php?p=1041999#1041999