VLF stands for Extremely Minimal Frequency and is the same engineering Utilized in detectors created for cash, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from three kHz to 70 kHz. Here are five explanation why you could possibly decide on a VLF about a PI https://www.ptwmonksupply.com/forum/topic/36074/metal-detector-hunting-for-beginners