VLF stands for Extremely Low Frequency and is identical technologies used in detectors created for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from three kHz to 70 kHz. Here's 5 main reasons why you might pick a VLF around a PI The MINELAB Gold https://www.bonback.com/forum/topic/279102/metal-detector-tips-for-urban-treasure-hunting