VLF means Very Reduced Frequency and is identical technologies used in detectors built for coins, jewelry, and relics. VLF detectors broadcast at frequencies calculated in kilohertz ranging from 3 kHz to 70 kHz. Here's 5 main reasons why you might pick a VLF over a PI The MINELAB Gold Monster https://www.sociomix.com/c/ugc/best-practices-when-using-a-metal-detector/971791767879203