VLF means Very Minimal Frequency and is identical technologies Utilized in detectors built for coins, jewellery, and relics. VLF detectors broadcast at frequencies measured in kilohertz starting from 3 kHz to 70 kHz. Here i will discuss five main reasons why you would possibly pick a VLF over a PI https://international.projectwet.org/discussion/top-metal-detector-techniques-beginners