VLF stands for Extremely Lower Frequency and is similar technologies Employed in detectors built for cash, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here's five explanation why you would possibly decide on a VLF above a PI The depth https://webhitlist.com/forum/topics/extreme-conditions-metal-and-gold-detectors