VLF stands for Pretty Reduced Frequency and is similar technology used in detectors designed for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here's 5 main reasons why you could opt for a VLF more than a PI Our https://www.bonback.com/forum/topic/279102/metal-detector-tips-for-urban-treasure-hunting