VLF stands for Incredibly Minimal Frequency and is similar know-how used in detectors developed for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz ranging from three kHz to 70 kHz. Here's five main reasons why you would possibly opt for a VLF more than a PI https://www.ekdarun.com/forum/topic/124824/the-art-of-detecting-with-a-metal-detector