VLF stands for Quite Reduced Frequency and is the same technological know-how Utilized in detectors crafted for coins, 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 go with a VLF above a PI https://dp5.boards.net/thread/1469/modern-design-metal-gold-detectors