VLF means Incredibly Reduced Frequency and is identical technological innovation Utilized in detectors built for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz starting from three kHz to 70 kHz. Here's five explanations why you could possibly select a VLF over a PI 2nd, Be certain http://hotel-golebiewski.phorum.pl/viewtopic.php?p=887599#887599