VLF stands for Quite Small Frequency and is similar technology Utilized in detectors crafted for coins, jewelry, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Listed here are 5 explanation why you could go with a VLF about a PI Disclosure: https://zenwriting.net/starc13/extreme-conditions-metal-and-gold-detectors