VLF means Very Lower Frequency and is the same technologies Employed in detectors developed for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Here are five explanation why you may decide on a VLF over a PI The GPX https://www.puffergroup.com/forums/topic/1130/gold-detector-secrets-of-legendary-prospectors/view/post_id/1480