VLF stands for Extremely Lower Frequency and is identical technology used in detectors developed for cash, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from 3 kHz to 70 kHz. Here's five reasons why you might pick a VLF more than a PI The GPZ 7000 https://www.jk-green.com/forum/topic/76991/gold-detector-mysteries-that-defy-logic